I've seen alot people mention or ask about changing out their house batteries to the golf cart deep cycle type. I did that this weekend in my class C Minnie Winne. They fit just fine.
Like many of the coaches here, my house batteries are located under the step in the entrance to the coach. I was concerned that the height of the Trojan T-105's might be too high for the space. After measuring, I discovered they would work fine. There is almost a couple of inches of space between them and the top of the step.
Changing the batteries was easy. However, if you use a taller battery, your battery hold down bolts are going to be too short. I went to several automotive stores and looked for an long hold-down bolt that was 11 inches. The longest I found was 10. I tried Ace hardware too, as the orginal is a square shouldered bolt commonly found at hardware stores. They had lots of the bolts, but none long enough. I eventually bought some threaded rod (5/16th, which is the orginal size) and made my own. I cut the rod 11 inches, screwed on a nylock nut and put a washer on top. Inserted it into the hole in the battery tray (from the bottom) and you got yourself a new hold down rod that will fit your new Trojans.
I have some pictures I will try to post for you to see in a few minutes.