Roadtrek CS owner

Overdesign is nice, but it can also cause more trouble than it is worth, like having to put on a hitch carrier because you used up all the space in the van. With 245 watts of solar and the Roadtrek optional 4 AGM batteries that would give over 400 AH I don't see very often that you would go below 50% in 5 days, unless you use a lot of power beyond the frig, and are in clouds or shade all the time. Beyond that you have the engine generator, so you could go for an hours ride on the rare occasion you ran low, and recover enough power to continue. More batteries will delay running out of power, but you still will, andyou will also have to recover all those batteries. The solar will short charge them, which is bad. If you don't have the right charger it will either short or over charge them, also bad.

IMO, there would be many other, better, ways to address your concerns than what they sold you. Heck, if you are that worried about the frig killing the batteries, have it changed out for a 3 way.