Where're you going to keep your spare? SS won't fit in the spare tire compartment. This could be a problem on a 2 axle transit...I know, not everyone carries a spare.
I do...and could change a tire if I wanted to...
That said, don't some Prevost motorhome conversions run SS on steer axles? Maybe due to weight issues? I believe I saw this pictured on an ad layout for one of the major bus conversion companies.
If memory serves correctly (always a challenge), the SS bus tipped the scales at over 50K lbs.
The only jacking problem with SS vs 13Rs would be with the drive axle. The steering axle is going to be just inches of the ground with either tire. Keeping the bus aired up would give a few extra inches.
When I bought jacks to carry in the bus (little ones for the front and big ones for the DA) I measured the deflated height of the bus...very low when unaired and flat...essentially on the ground at the front. Airing it up will allow a jack under the bus.