I have a 31DS, so they may be similar. I have the single battery compartment that had one 12V and the slide out tray to gain access. I replaced this battery with a 6V and added a second in the poly compartment of similar size just next to the existing battery. Access is much tougher in this arrangement, but I went with sealed/maint free batteries, so not too concerned with it. There is some decent space up under that area, but not sure it was enough for 4 batteries, and if there were, I am not sure how you would build a tray to access them. As noted by Roy, you will want it ventilated which if it is an open tray sort of arrangement would be fine. There will be a lot of weight on this setup, so aluminum may not be your best choice as the movement of the MH will cause a lot of wear on the aluminum over time.
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2016 Jayco GreyHawk 31DS
2016 Jeep Cherokee Trailhawk Toad.
SE Washington State
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