Thanks to everyone for your comments and suggestions.
I donít plan to use the camper in the winter.
I already have a 2000 Honda generator.
The camper does have a gas furnace. From thespecs the furnace/blower appears to draw 3.4 amps.
I plan to take the camper in and see what needs to be done to charge the battery from the truck. I will also ask about a battery disconnect switch.
Iíll look into the LED lights some more, but from one of the internet sites I looks at, it appears I could buy a spare battery for the cost of replacing two double halogen lights with LED lighting (double LED light with fixture @ $63 X 2 = $126). Iím sure there are less expensive ones available so I will look some more. We donít use the lights that often. We have some small lights with AAA batteries for reading and other things. Generally use the big lights only when fixing meals.
Charging the battery to 100%? Do I need a voltmeter or some other instrument for that?
OK. A battery tender sounds like a good idea. What is a battery tender? Sorry, still learning but with a substantial learning curve.