Originally posted by Pick
I would not downgrade to a 5 lug hub. The number of lugs is directly proportional to the weight the axles, hubs, wheels and tires are designed to carry. Your asking for trouble IMHO.
I agree with Pick. I have seen "multi-lug" spare wheels that will fit various 4, 5, and six lug patterns. If anything, maybe check these wheels out and see if one would be satisfactory, load-wise, for your trailer. If you have to make one fit the other, I would try to make the suburban match the trailer, instead of the other way around. In compromising, always try to upgrade to the heaviest item, rather than try to make the heavier application work with the lighter. That is a recipe for disaster.
Before dismissing this out of hand, the axle shaft on your Suburban should be the same as the axle shaft for the 4X4 unit, and should be a straight swap. Front rotors may be more of a challenge, but should also be do-able.
Then, get a spare wheel from Andy at Inland RV, assuming you don't already have one, and put a load range C or D tire on it to match the trailer tires (P225/75R15), and keep it in your Suburban as a universal spare.
(on Marie's computer)