RMS is right on the money. My truck came with 22.5/10s and they are very expensive (compared to 11s. So even though 11s are barely taller, they would not fit under the truck. I ended up with 11/lo-pros, which are still cheaper than 10s. the moral of the story is clearance is tighter than it looks.
Doc Weaver '98 Freightliner FL60 pseudo toy hauler