AGC,
Here's my suggestions:
First, at 8 years and with unknown history on the tires, replace them. Folks love Michelin and they are good.... however, they are pricy. Sprinter OEMs are usually Continental VANCO Four Seasons. I've had two RVs (B and C) with Vancos. They are perfectly fine. Or you could go for Coopers or another brand. Check Tire Rack for ratings. Here's the thing to remember about RV tires.... they are expendable items. RV tires are subjected to a lot of abuse: punctures, loads, heat, sitting around, being used for thousands of miles and then sitting for a season. You have to have a different perspective. They will last about 5 - 8 years regardless of how many miles you put on them. They will AGE OUT long before they WEAR OUT. So buying a 60-70K mile tire when you put only 10K on them a year is not cost effective. Also, since they are subject to flats and other damages, a good solid economical tire THAT YOU CAN GET ANYWHERE is probably a better idea.
Next..... before jacking around with the Sprinter's suspension..... make sure the tire pressures are set to the PSI indicated on the door placard. MORE PSI above the placard PSI not better or advisable. Inflation above the placard rating will make the ride harsh. The tires are really part of the suspension "system" and you need the sidewall to flex and absorb road shocks.
The placard setting is for max GVWR. You are probably less (get your rig weighed when all up for a trip.... all aboard.... You should not be exceeding the GVWR.) If your are less than GVWR, you may consider reducing the PSI a lb. or two. Yes, you will hear a lot of preaching about fore/aft/left/right weighting and consulting the tire gospels for correct PSI based on individual axle weights. Yeh... that's cool. But who has time for that??? Just get it weighed to be sure you are not over GVWR and set the tires according to the placard. That will get you off to a good safe start.
((IF over GVWR... the answer is NOT to increase PSI.... The answer is to chuck stuff out of the RV to get the weight down.....)
NEXT.... Don't jack around with the suspension. You need to take a bunch of trips and put some miles on the RV to understand how it works and doesn't. There's always a rush to judgement about 'fixes' for an RV suspension. RVs are like barns on wheels. They are subject to a lot of different forces: wind loadings, road camber, road surface, higher center of gravity, fore and aft balance than a car or pickup. They are a different animal entirely. It would be wise to get to know your beast's quirks and plusses before messing with what is a pretty satisfactory set up provided by Mother Benz.
IME, with the View.... sort of a Carnival cruise liner on wheels.... the problem is side to side movement along the long axis. You see this when you step aboard through the coach hatch or walk about inside. It's like a boat on the water. The reasons are complex.... but more roll resistance is NOT THE ANSWER. E.g., bigger roll bars. If you think it rides rough now... bigger bars and harder shocks will not make you happy. The solution, to install SUMO SOLO absorbers front and rear. They will dampen in one direction without applying equal and opposite forces to the opposite side of the RV. BUT... put some miles on before making a change......
Basically, these RVs like to bob, wallow, and roll under certain conditions. It's their nature. Learn to drive a bit slower; anticipate road conditions; brake before corners not in them; accelerate out of the corner at the apex keeping everything balanced. Some gas station access points with deep swales or off camber sharp turns will create a lot of oscillation as the RV straightens. GO slowly! And if it gets too uncomfortable look to the SUMO SOLOS.
Last. These beasts will 'kick up their heels' on certain bumps because the rear suspension is stiff and it's lightly loaded. So... fill the fresh water tank.. to add some weight behind the rear axle.
A lot to think about...... just remember they are like 'Dumbo' the elephant traipsing down the highway in tutu and ballet shoes....... you can't make them into a Ferrari.
Safe travels.
I have a WBGO VIEW PROFILE 24G. If it is lightly l