That makes perfect sense to me, I also have a 2nd set of rims and tires just don't have the big mud tires mounted on them yet.My factory rims have sand/mud tires on them. I dont want to go to the tire shop and spend $25 to swap the tires on and off. Living in NJ I can be in very large sand pits with nasty peanut-butter mud and the next day be in hard pack trails with rocks. Thats why I want separate tires and wheels ready to go.
I think he wants 11" cause he has new stock tires.You could always grab some 10" wheels and spacers/adapters.
I will have a set of well used oem rear rims to sell in a couple of weeks.
Next week I pick up some new OMF reinforced rims to replace my oem ones.