I take 1.5 yards of topsoil in my '04 Taco std cab 4-cyl 5-spd. It pulls and handles fine. The only issue is those darn rear springs, they are so flimsy. <img src="/forums/images/graemlins/angry.gif" alt="" /> 1.5 yards and mine is hard on the bumpstops.

Maybe try humus instead of topsoil, it's lighter and seed takes to it very well. So you could get more per load.

4x4Wire's Toyota Section
1995 FZJ80 LandCruiser - 3 locking diffs, +200k mi, JD HIR's, 285/75R16 Nitto TG's
Olde North State Cruisers