If it's a single axle you won't be able to fill it more than halfway with mulch, less with soil. 3 yrds of mulch in my 6x12 open squats it almost to the fenders and it has 15" wheels on a 5,000 lb. axle, BUT the springs are not stiff enough for more than 3 yrds which is roughly 3k lbs right? Also be careful if you don't have trailer brakes. The 3 yrds mulch in my trailer is very heavy to take off and stop.Originally posted by CSRA Landscaping
Be careful if you plan to fill that thing up with soil or mulch ... I don't know how well the sides will take to it like that.