Great ideas, but
A lot of those problems are caused by inadequate wiring in the truck and trailer. Maybe the newer trucks with trailer towing packages are different but the on the older ones (70's-80's) the factory only put the very minimum size wire to carry the OEM truck light. Trailer mfgs are no better. Have a factory built 28 foot gooseneck wired with 16 ga wire.
Once had a 73 Chev dooley with a 12 foot trailer and could only get 8.5 volts at the back of trailer. with factory wiring.