I’ve been using the self wash at a car wash as those springing brush machines at my local place always miss something. A few minutes with the handled soap brush does wonders.
Im at 23k on stock tires for the AWD non beast and still have plenty of tread to go. Should make it to 30k before I hit the replace level. It's an everyday driver with a few excursions on rough roads/trails.
My take on this idea. I used L track fittings that had a threaded boss (3/8 fine thread), some chain, eye bolts and the molle shelf off Amazon. It has 11 inches under the rack and I put pipe insulation on the sided to prevent scraping. It does not swing. L track amazon link.
For the eye bolts...