Thanks gents,

Tom, the new tires are 1300 lb rating each so I assume 2600lb – 600 lb trailer weight = 2k max load, unless axle can’t handle that.

I’m going to bring a scale and weigh an few stones to get an average, then do some quick math with a 10% margin of error. As Dutchboy suggested I’m now thinking 2-3 loads.

Will balance evenly. I’m guessing I’ll be able to cover the 4×8 floor up to around 1 foot tall on each run, but will know more after I weigh those rocks.