My old Southwind had water tank under the bed. Once, b4 boodocking for weekend I was distracted while filling tank, heard water rushing out of manual fill pipe. shut off water & found bedroor floor bulging up about 2". I had to dismantle the bed& remove plywood from center of B/R floor to level it. Dont bank on vent to save you. Current DP has big tank with plenty of space to bulge , and capacity to carry it. But i don't fill it much over 3/4, once burned ya know.
2000 DSDP, 3883,Freightliner,330 Cat, 07 Jeep Commander 4x4toad.