Not bad at all, i think you beat me hands down.

i had almost that amount in my 1000 ute it was all srcap metal and my towbar was just scraping the ground it was only like 400kg but it was lowered 2 inches :)

i had 600kg of bluestone in it... only had to drive it 600m but tell you what, underssteer was prelevant as the cars front wheels were barely contacting with the road, it was a slow drive with 2 speed humps (unavoidable) and the car was resting on the diff i think from memory

My first ute I went to the local greens recycling to get a load of mulch. I asked the loader driver for 2 half loads. He said no and gave me a full load (of mulch), scary sight seeing a front end loader dropping just under a cube of mulch 3 inches behind your head. It was a very slow ride home and I have never been back.

My current ute is on the bump stops with a whopping 80kg. There is not a lot of travel down to the stops. It is still the best multi purpose vehicle ever though. Race car, daily driver, removal vehicle, plumbing ute, wheelbarrow for collecting firewood, chook s#@t, loading up garden waste etc, and my wife still wants me to get rid of it, see how she is tonight as she had to take it to work today.