Funny coincidence... I bought my 125g from a guy in a mobile home for $300 because he had to get it out quick because it was breaking thru his floor.
The floor in a mobile home is only plywood.
I you're going to attempt it (which I wouldn't recommend), at least put down a large sheet of 3/4" plywood as a base to help distribute the weight over a bigger area (at least 6-8" around) than the footprint of the tank.
"Damsels are the yapping, ankle-biting chihuahuas of the ocean.
They have no concept of just how small and annoying they really are."