I have a 6.5'x12' tilt landscape trailer that I use for dump runs but mostly hauling firewood. I think it is rated for around 3k lbs. Anyway, went to the dump Saturday morning and saw a sign for free fill, we load, you haul. Me having an empty trailer thought, sounds good. I was thinking if I have a couple of scoops put on, should be fine and around 3k lbs. When the guy dumped the second bucket full onto the trailer, one tire went very low. I pumped it up and drove home - very slowly. I started shoveling this stuff off and realized why my vehicle was working much harder than normal, this stuff is super heavy. Wet, dense, clay-like. So I looked up the weight/cubic foot and for the load I figure I had. 6500-9000 lbs!! It is a wonder nothing more than a flat tire! I had no idea, but will be much more cautious in the future! Also the tires I had on were only 1 and 2 ply!