In article et,
says...
Hi all . I am living in a large mobile home not motor home but mobile
home and am in the process of setting up a 55 gal tank. Ive been giving it
some thought and I am a bit worried about the weight.

If it's a fairly modern double or triple wide there should be no problem
as long as you have it against a wall and not in the middle of the room.

It's also a good idea to spread the weight. Put it on a bookcase or, if
you have a 4 legged stand, put a sheet of 3/4" plywood (tastefully
painted, of course) under it.

I live in a double wide and while my tank isn't that big, I have floor
to ceiling bookcases that weigh as much or more than your tank :-).

--
Homo sapiens is a goal, not a description