Converted to Lithium-Ion be careful.
I know a few people have converted. This article although not truck camper specific warns of the dangers of unsupervised Lithium-Ion charging. https://www.sfchronicle.com/bayarea/article/Conceptio...
Forum Discussion
I just sent back a jump starter with a lithium iron phosphate battery. It was useless to me as I wanted a 12 volt power supply for inflating rafts at a launch site and it was designed only to jump start a dead battery. UPS required a sticker on the package that said in big red letters "Danger Contains Lithium Battery. Do Not Ship By Air". I guess they're not taking any chances.
