Expert Answers about GMC C/K Series Pickup

• Is Roadmaster RM-9400 Even Brake Flat Towing Brake System Actuated By Air or Electrically
• The Roadmaster Even Brake, part # RM-9400 actuates the brakes using a high speed air compressor, not an electric motor, which operates more quickly than an electrical motor. The unit is self-contained and other than a power connection, the transmitter connection to the brake lamp switch and the breakaway switch, there are no other connections to the vehicle. It doesn't need to tap into vacuum lines. I've linked to a video showing a typical installation.
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• RV Stereo With Integrated CD/DVD Player
• The Jensen # JWM10A stereo you referenced is an AM/FM receiver only. It has aux inputs that would allow connection of a CD/DVD player, but there isn't a player integrated with the unit. If you're looking for something with an integral CD/DVD player, Jensen offers the # JDVD1500. This unit is a similar size and cost as well as a similar power output. The unit features Bluetooth connectivity and can support MP3 and WMA files. I've linked you to the stereo I mentioned as well as to a product...
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