Ras
I just installed a set today.
2016 F150, 1868 cargo capacity. Bilstine 5100 shocks, front set 3/4” higher than oem. C rated all season tires.
Trailer 22’ Passport, average tongue weight 900. Equalizer hitch set up properly.
I had Firestone air bags last vehicle, forget yo let air out, rough ride. Plumbed together. If you travel off camber situations like roads, gullys, etc, yes, air bleeds to higher side of vehicle. Some people also install air bags to increase capacity, I didn’t.
I put the RAS on not to gain weight capacity but-to “stiffen” the rear leaves. Raised back of truck 3/4” which brought it back to original rake without the Bilstines. I typically carry 300-500 lbs bed of truck daily at work, that sets truck down so all leaves were active. Not much reserve capacity. Ford softened springs for city drivers wanting a truck.
Ride is no stiffer than before. “Feels” to have tiny bit less body roll but was not installed for that. No reason for Hellwig for me as I know it’s not a sports car plus I want the axle travel for cross country travel.
Haven’t towed with it yet but the reviews on F-150 forum say good things.
If I still had a 250 with 3500 lb capacity, no, I wouldn’t put them on. I don’t max out tow or weight capacity.
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