I wouldn't go higher than 28" as 30" doors arent' always 30" not everyone installs them right. either that or go taller but not so wide. say 72"X28"X36" also I would want to know what the floor was made of as was mentioned earlier. I personally wouldn't sleep well unless I did some extra support. I removed a frame from under a mobile home once with a friend and set in on 4 stands one on each corner. the frame sagged over 8" at the middle. thatsure changed my opinion of their strength. they arer made to go down the road once then sit there for the rest of their lives. I don't want to discourage you but just think it over and do your homework on what you will need to do to the house to support the tank properly.