Coach Batteries

Looks like I will be replacing my coach batteries in the near future, they (only have 2) aren't holding a charge very long, this happened a few months ago & I found they were low on water & the cable hookups needed cleaning very bad, I fixed this problem, but now they are not holding the charge again for more than a few weeks & I do have the 12 volt switch in the off position when at home.

What batteries should I be looking to buy, we only use the RV about 6 months of the year & that only for 3 or 4 days at a time.