I dont think the weight will be a problem. I have a 28 gallon tank under my trailer and it doesn't make as big a difference as you might think. I can move it around the yard or position it in camp by hand. My trailer is SOA on 35s and quite a bit heavier than yours and it is still easy to move.

I would love one of those, but I don't really need one, however sometimes want outweighs need.