Are "sleeves" and "shims" the same thing with regards to E450 alignment? If not, what's the different functions of the two in Ford Twin I-Beam suspension systems?
The first time we had our E450 aligned at our mechanic's shop (a commercial truck shop) was several years after we had bought it new, and even then there were no issues with it wandering when going down the road - I had it aligned just as routine maintenance. I don't know if during manufacture Winnebago had the chassis aligned or if we were just lucky with no wandering right from the start.
However, when our truck shop did align it they said that it needed some shims installed, and they brought the shims out to show me what they were (they looked like heavy steel beveled washers - thicker on one side than the other). I had them do it and it still steers excellent with no wandering (the same as when it was new) - one hand on the wheel is all that's required, except in cross-winds or when big trucks pass us.
Another related question is - are these shims, then, what's required to adjust Caster on Ford E350/E450 Twin I-Beam front suspensions?