ktm300,
So, how much cargo weight do you have in the rear of your Sprinter, and how is whatever cargo you are carrying distributed
relative the the rear axle?
More cargo between the front and rear axles....or more cargo behind the rear axle.
Unless you have > 1 ton of weight in the back, you can drop the tire pressures quite a bit.
Best to go to a truck stop and weigh each axle then adjust the tire pressure from the "weight on each axle"
The ~ 80 PSI rear tire pressure is for a fully loaded RV or a Cargo Sprinter with about 3000 lbs. equally distributed
in the back of the van.
80 PSI gives the tire it's max. weight carrying capacity, but is completely unneccessary if you don't have the weight that
needs supporting.
Is the rear of your van "wiggling" around all the time, or is it "chattering" over bumps and road imperfections.
With heavy duty rear suspension, my 3500's have always "chattered" over little road inperfections if the tire pressure
is too high.
My first T1N 3500 was a real handful when I first picked it up.
The dealer had been dilligent and put 80 PSI in all six tires.
Took me half a day to figure out what they had done and drop the pressure (empty here) back to around
60 front-65 rear. Made the Sprinter so much easier to control. No chattering....no white knuckles.
Roger