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
All of the consumer grade drop in lithium batteries on the market today have a BMS that controls temperatures, voltages, cell balancing and short circuit protection. They are pretty idiot proof.
