We have an 1989 U280 GV and are looking to upgrade the house batteries. I have been reading all the old forums about the AGM's and the gel. I want to get the AGM's. Is there anything i need to worry about as far as the charging system on this old coach. <br/>Will they be ok? I'm looking to do a lot more boonedocking and the 4 year old wet cell batteries are not getting it...