Added Air-Lift 1000 bags to the 'Burb last Thursday after getting back from our three-week Michigan UP trip; went out immediately to a little-known but beautiful campground with everything fully loaded as if we were headed out for another month. Big improvement at 40 lbs pressure.
60 lb propane tanks and 10 gallons of gas on the trailer hitch plus 10 gallons of fresh water, a Yeti cooler, and a reasonably full set of tools - including some recovery stuff - in the back of the truck all makes for a bit of a load. With the air bags pressurized, the WDH works better. And maybe the tires won't wear so fast.
Next step - weigh everything again to double check vs. specified capacity.