Russ to answer your question that was never asked...
I took an "L" bracket and clamped it in a vice. I tried like hell to bend it and just couldn't do it so with that I just went ahead and welded away. So far they haven't even showed any bending at all when full and after travelling down the highway when full! I guess time will tell but I'm not looking for any of them to bend any time soon! I used some pretty tough stainless!
Len yes your correct that using a rectangle tank over a round tank would definitely yield you more capacity but... 3 things!
1, the tank was free and in great shape!
2, how much "STUFF" does one really have to carry around before dumping?
3, if you look at the space that was wasted by using the round tank, it really isn't that much! Besides, I gained more floor space so it goes both ways. Lose on one side, gain on the other!