Sorry to dig up an old thread, but I thought I would add my data for future reference. I have a 2020 260RD, before self leveling, and other recent additions. I recently weighed my rig. It has full propane, etc, but no water, and the holding tanks are empty. I do have a 4KW Onan generator in the front compartment, with 3 gallons of fuel, and my weights were:

Pin 1660
Axles 6660
Total 8320

It is a little heavy in the front due to the generator and supplies, but still under 20% pin weight.

Bkoyle