I don't have a TC, but I do dry camp always. I also disappear for 2-3 weeks at a time on occasion.
The first thing I'd do is add another 12 volt battery, and probably get a little larger generator in consideration that solar isn't something you're interested in at this time. I am a fan of Champion generators, although most folks here on the Forum will recommend Honda or Yamaha.
I use a 1500/1200 Champion, very reasonable cost @ about $200, (Amazon) dependable, parts are easy to get & customer service is very good. A step up from there is the 2000 Inverter type @ about $375.( SuperGen)
TORKLIFT is well know here on the Forum & a well respected company. They have an undercarriage battery enclosure that fits on the frame of your truck, called "HiddenPower"