I've got them and if it didn't cost so much to remove them I would. Ride is much worse than stock when unloaded.

WOW,, Really. I have the 10 foot camper with a slide out in the back of my dodge 3500 so I have about 4 thousand in weight but with 60lbs in mine, its like your ridding in a 745i Have the double tork hitch with a 18 inch extention so it will clear the back of the camper and I put about 600 pound on the ball. Put them on after camper was installed so I have to take your word for it without. If you have a dodge let me know. IN calif now, and run a 10 car stinger. Come right through DFW every trip. Brake out the grill and if I can get a 80 stinger rig down your street and you'll let them go , we might can work this out. Like mine well done.......

That's why you don't run them pumped up with out a load. You are basically negating the suspension on the back of the truck running them aired up an not loaded. Of course it's going to ride like a dumptruck.

10-15 lbs. in mine unloaded.
75 lbs. when towing & loaded.

With my old 2 dr. Tahoe and 2500 Avalanche, I used to run 25-30 lbs. in them when not towing, just to keep the rear-sway under better control.

I've got 06 PSD and towing just over 11K. Hyd. over electric brakes, it tows fine, a dually would do better. The air bags are a must. I can tell that I'm to the outer limits of what should be towed with the truck.