Maybe your truck has a beefier electrical system than mine does -- but the owners' manual for my Tacoma limits the wattage that I can draw from my on-board power outlets -- I doubt it would run a battery charger. Check your manual before you try this -- could blow a fuse. No big deal if you do, but not fun, either.
And definitely do not sink a lot of money into solar or a gas generator or whatever until you get the seal of approval from the lady.
My wife agreed to try boondocking one time, on a trial basis only. She was hooked, and I then upgraded my system so we could boondock a lot more. (No solar, unfortunately -- we camp in very deep shade almost all the time. If you are in the sun, solar is absolutely the best, in my opinion.)