More information, I received permission to post this from Winnebago's Tom Pilgrim who was quick to provide information:
Good Afternoon Michael,
It is difficult to provide some of the information you’ve requested with the limited information provided... & not being able to inspect the condition / wear pattern on your steer-tires makes this a guessing game, but here goes.
The 6,000 miles on the odometer does show that the wear must be fairly aggressive... but is the wear ‘camber-related’ or perhaps ‘toe-in’ related? I’d suspicion the latter due to the fact the caster & camber are ‘fixed’ / non-adjustable.... i.e. factory set by Mercedes-Benz. I’d be looking for any ‘feathering’ of the tread across the face of the tire...or is the tire actually wearing smoothly? Push the palm of your hand across the face of the tire – smooth-in (vs rough) equals Toe’d-in..... & smooth-out equals toe’d-out... Simply, tires ‘talk’ and someone needs to listen & interpret.
The request for alignment specifications on the Sprinter chassis is a bit more difficult to provide! Mercedes Benz requires usage of a special tool – i.e. a Romess Gauge, to verify the chassis ride-height. Simply, they / M-B requires a reference number or ‘value’ from this gauge which reflects the weight on the steer axle... & this measurement is referenced to a chart to determine the Camber & Caster settings needed. This tool is also used to determine the correct Toe setting... All-said, customers are basically required to visit a capable Mercedes Benz dealer that possess this tool.... plus the special adapters (if needed) that provide clearance to equipment installed in the aftermarket. Since this gauge isn’t a mandatory tool, and not all M-B dealers have alignment equipment in-house, so you will need to phone the local M-B dealer(s) to question & verify who’s equipped & capable!
Additionally, the average alignment technicians will certainly benefit knowing the scaled weight of your coach ‘loaded as normal’... The Sprinter chassis is a truck chassis and everyone loads their truck / RV differently. Weight & the distribution of the load has a direct affect on the chassis ride-height and can affect handling & tire wear. Alignment machines simply measure angles, etc...... it’s up to the technician to drive the vehicle & verify any handling issues, interpret the tire wear that exists... & then compare the actual / existing settings to the specs... & then factor-in the visible wear to determine what needs to be addressed.
As a convenience to you, I’ve provided a little info regarding ‘tire inflation pressure’ .... you’ll note that this is actually information from Michelin’s load chart (which would mirror your Continentals).... as I couldn’t find a load chart on Continental’s web-site. I think you may want to have an individual that’s knowledgeable / able to inspect your tires & help you determine the best course of action regarding placing the original steer-tires into service on the rear axle.
Hope this information is helpful!
Sr. Service Trainer
And a followup note from Tom: I’ve done a little research regarding this special gauge.....http://www.romess.de/index.php/products/vehicle-gauging/cm-09606. It appears to be a simple electronic inclinometer, but the ‘tool’ has mounting / indexing points that must contact predetermined suspension components to verify the ride-height on the steer-axle. Unlike a typical Sprinter delivery van, our M-B chassis will be ‘loaded’ at all times...... with the customer’s personals being the ?-factor that we cannot 2nd guess. I wish I could provide a single alignment specification, but can understand M-B’s logic with wanting ‘the rest of the story’ too!
I had to call around for a while to find a place to do the alignment, I ended up with an appointment about an hour's drive from me in Stockton CA at Hewitt's Alignment.