Okay understood, thank you all for your comments and advice. You may be right about a market not being there.
The anti-locking steering wheel device costs $2 to $10. No tearing apart the steering wheel column either. Though this is still under construction. With this device you won't have to keep your keys in the ignition.
The light assembly costs about $20. Once you connect the RV the device auto disconnects your vehicle's harness from the tail lights and allows the RV to power them. Once you disconnect the RV the harness is automatically reconnected. It requires splicing 8 wires and running a 20 foot 4 pin plug to the front of the vehicle. The kit comes with waterproof crimp-on butt splices. You won't have to disconnect your dinghy's battery or pull any fuses.
I am currently working on a brake assist that will cost less than $100 but still researching.