Hi
I managed to squeeze in two Interstate U2200 6 volts in the battery compartment. I took the trays out and then loaded the trays and the batteries back on the two shelves. VERY tight fit I think on the lower battery I had to bend the top shelf. It is a light metal and can be the bent back. I then toe nailed two light metal screws at an angle to hold the trays in and of course the straps have to be put in with the trays and the batteries. The top of the top battery has just enough room to rotate the battery switch. The adding of water or checking of water is going to be a pain.
Can be done just be prepared for a tight fit and tilting and juggling of batteries to get them in. For such a big 5th wheel they could of given us a couple of more inches.
gl
Don
