Hydraulic Trailer Mounted Message Boards


  • Graphic Capability
  • Compact Trailer Design
  • Quick Message Selection
  • Removable Tongue
  • Lockable Cabinets
  • Password Protection
  • Powder Coat Paint
  • Tongue Jack (with wheel)
  • NTCIP Controller Standard
  • Independent Module Operation
  • Photocell for Auto dimming
  • RF Immunity








Quick Selection Switch

K & K Systems’ Quick Message Selection Switch allows users to create their 16 most used messages. Selecting the correct message is easy, just turn the thumb wheel to the desired number.
Quick Message Select


Changeable Message Sign

MUTCD Symbols

Arrow Board Patterns














  • Width: 68”
  • Length with tongue: 148.25”
  • Length without tongue: 98.5”
  • Salt Spray: 1,000 hours
  • Paint: Powder Coat
  • Main frame: 2”x5”x1/8”
  • Front/Rear Cross members: 2”x3”x1/8”
  • Wheels: 15”
  • Axle: 3500lbs leaf spring
  • Fenders: 16 gauge bolt on
  • Jacks: (4) adjustable corner jacks & tongue jack with wheel
  • Hitch: 2” ball

Display Modules

  • Pixel Matrix: 27×48 Pixel Arrangement
  • LED Module: Each is 6×9 matrix
  • LED’s Per Pixel: 3
  • LED Type: Agilent amber 592NM
  • Viewing Angle: 30 degrees
  • Visibility: 4800 feet
  • Hours: 100,000 hour LED
  • Lines: Displays 3 lines of text and also displays Graphics
  • Characters per line: 8 (12 characters optional)
  • Character Height: 12”

*If one module fails the remainder of board is unaffected.


  • Locking lug nuts
  • Cell Modem
  • Radar
  • Pintle ring or bulldog hitch
  • Electric or hydraulic brakes
  • Custom Paint
  • Other Options available
  • Solar tilt & rotate

Display Enclosure

  • Construction: Extruded Aluminum 6063 alloy
  • Length: 97”
  • Width: 57”
  • Depth: 6”
  • Paint: Powder coat paint
  • Salt Spray: 1000 hours
  • UV Resistant: 500 hours
  • Seal: Weather resistant
  • Venting: Vented top and bottom
  • Front face: 1/8” Lexan UV matte finish
  • Raising and lowering of display: Electro-hydraulic

Power and Charging

  • Batteries: (4) 6 volt batteries (450 combined amps)
  • Battery Charger: 110 Volt, 1000 watt, 60amp
  • Recharge: 24 hours
  • Onboard diagnostics to monitor: Solar, battery, and
  • load
  • Solar: (2) 80 watt Solar panels
  • Regulator: 30 amp regulator with low voltage & high
  • voltage disconnect.


  • Preprogrammed Messages: 260 also includes arrow and MUTCD symbols
  • User programmable: 100
  • Message Timing: Slow, medium, fast
  • Dimming: Auto or Manual
  • Protection: Password
  • Quick Message Selection: Thumbwheel to quickly select between 16 user programmable messages.
  • Controller Display: LCD
  • Data Entry: Mini Keyboard
  • Memory: Non volatile

*Pre-wired to accommodate radar, cell modem, and PC
*“Auto Resume” after power failure


ADD80W Additional 80 watt solar panel.
ADDB06225 Add battery pack with two-6 volt batteries for a total of 225 amps.
ADDBB422514 Additional cabinet with wiring to fit middle-size style trailer.
CELL-FEE Fee for setting up the modem.
CELL-MODEM Cell modem.
CPAINT Custom Paint: other than white, orange or black  (15 day lead time).
CT Conspicuity tape 16 ft (reflective).
EXB12480 Replace battery pack with 12 volt 480 amp battery.
EXT-P1 “Extended power package.  160 watts of solar power, six (6) additional 6-volt batteries and cabinet.”
HM Hour Meter.
RADAR Radar.
T&R Add solar tilt and rotate.
TAXL Axle lock for anti theft.
TBBD Bulldog coupler & adjustable height channel.
TBPR Pintle ring hitch coupler & adjustable height channel.
TEB Electric brakes.
TEXOT Extendable out riggers.
THB Hydraulic brakes.
TLLN Locking lug nuts.
TLT LED taillights.
TP Tow plate – 4″ x 6″ angle with 2″ ball
TPLUG-6 6-round contact to 4-flat adaptor
TPLUG-7 7-round contact to 4-flat adaptor
TPLUGA-6 6 contact metal connector with spring.
TPLUGA-7 7 contact metal connector with spring.
TSKID Anti-skid tape on fenders and battery compartment.
TSTAT Traffic Statistics package.  Able to download important traffic stats through radar.  Downloadable to a user provided laptop.  (NOT ER10)
TTS 15″ spare tire with mount.


Question: How do you prevent the unit from being stolen?
Answer: We have three safety features that prohibits theft of the unit: 1) The tongue is able to be taken out of trailer once setup into place, 2) The tongue can be left in and a padlock can be placed into the hitch receiver, or 3) You can get the optional wheel locks that keep unit from being transported.


Question: How hard are they to program?
Answer: Our Portable Message Signs are very easy to program. Please see our instructions for programming under “support documents” for each model.


Question: How long will they run?
Answer: This depends on how the systems will be run & how much sun they will receive each day. Our Systems should run year round 24/7 in most cases and the battery bank should let the unit run for about 21-30 days without solar.


Question: What can you display on the message signs?
Answer: You will be able to display any text you would like to put on them and also put graphics and arrow symbols on our full matrix models. They come with at least 215 preprogrammed messages when you receive your unit.


Question: How many characters will fit on them?
Answer: Our standard system will display three lines of eight characters per line. Our full matrix message signs will display three lines of optional 10-12 characters per line, if needed.


Question: How many batteries do you use?
Answer: Please see specifications on each model under “support documents” on the website.


Question: How much sun do I need to run this?
Answer: Our standard system should be just fine in most cases. When you get into your more northern states then you may require additional solar and batteries, but it also depends on how long the system will be run.


Question: What size message board do I need in my state?
Answer: Every state is different on their needs but we basically have two models to choose from for state roadways. The full matrix (can display text and graphics) and the character matrix (displays text only). You will have to check with your State Department to find exactly which type you will need. All models will work perfectly for any county or city streets.


Question: What options are available for these?
Answer: There are tons of options for these message signs, but some of the most popular are: radar, cell modem, GPS, Central Software Management, and much more. Just go to our “options” tab for each model to see available options.


Question: Do you rent these or just sell them?
Answer: K&K currently just manufacturers them to sell. If we have older, refurbished units on hand, we will rent to our local market.


Question: How many messages will they hold?
Answer: Our systems come with 215-260 preprogrammed messages and 100 user changeable slots that you can place multiple messages in.

Question: If the batteries run down, how long will it take to recharge them?
Answer: If hooked up to the internal AC charger, this charging process should not take over 24 hours.


Question: What is the quick selection switch?
Answer: K&K Systems’ quick message selection switch allows users to create their 16 most used messages. Selecting the correct message is easy; just turn the thumb wheel to desired number.


Question: Why do I need the solar to tilt and rotate?
Answer: The solar tilt and rotate is designed to allow user to gain as much energy as possible from the sun. This works well in those winter months where there is not a lot of sunlight. (not available for all models)


Question: Do they meet all highway regulations?
Answer: Yes, our changeable message signs meet highway regulations.


Question: Do you carry parts for these?
Answer: Yes, we are the manufacturer and have spare parts available.


Question: Is there a way I can recharge the batteries myself if I need to?
Answer: Yes, our systems come with an AC battery charger that has an external plug for you to plug your extension cord into. The plug is located on the side of the control cabinet in newer models.


Question: Why do I need it to show graphics?
Answer: Graphics come in handy when trying to display a message as simple as possible followed by text. An example of this is a graphic of an “arrow left” followed by text message “merge left”.


Question: How high will the display rise up and why do I need it to rise?
Answer: The display will rise to 7 feet to bottom of display. The display needs to be raised so drivers can see behind the unit in case there are pedestrians on the other side and to meet MUTCD guidelines.

Question: How do I raise it up and down?
Answer: There is a toggle switch located inside the control cabinet to raise and lower the changeable message display. You must also release the break located on the center mast pole before raising display.


Question: Do the messages flash?
Answer: They can be programmed to flash.

 Quick Video on how to program message sign

Quick Video on message selection switch

Click Here to see all our Video

MB9757 Controller wiring

MB9757 Keyboard wiring

MB9757 Module 1 of 2 wiring

MB9757 Module 2 of 2 wiring

MB9757 Solar wiring

MB9757 specs

MB Programing Manual

MB9757 – CMD – Operating Manual

MB9757 Battery wiring