I know a guy who rolled his huge hydroseed truck--expensive mistake. However, I am guessing the floating baffles would not be suited if you have paddle agitation.
The website didn't say whether or not they would fit through an 8 inch fillwell.
Interesting idea...would about 50 wiffle balls work? Or 100 rubber ducks? How about 150 golf practice balls? Anybody try one of these systems--what was your experience? Was driving easier and safer?