I got 10 48-LED panels for $18 on eBay, complete with the sockets to plug them into the bayonet lamp sockets on the Trailmanor’s indoor lights and the door light. They work great. They are backed with double-sided tape so mounted inside the lights with no problem. No more big drain on the battery when using the lights.
The only indoor light not yet converted is the bathroom fluorescent, which isn’t working too well – it wants more voltage to go full-on than it should. I will strip the tubes and electronics except for the switch out of that, and will wire about three 48-LED panels inside of it.
Now, to do the running lights and tail lights. Those might be more expensive, but should not be bad.