When I bought my 303 RLS I was to told tha 16" wheels would fit and exchanged the 16" wheels and 235/80 16 tires from my old 5th wheel. There is not enough vertical clearance and one of the left side (whch carries 600lb more weight empty and contains most of the storage) tires has made contact with the trailer but done only cosmetic damage so far. I am now looking at ways to get the clearence without losing the correct trac feature. Some people have gone to a 225/75 LT tire which has a 1.5" smaller diameter.
This is a somewhat frustrating issue but otherwise, we have been very happy with this rig so far and not regreted our choice.