At our shop we keep 14s, 15, and 16s in stock in trailer tires and have our tire distributor a 1/2 mile up the road so we can take care of most any tires promptly. Some folks bring in just the wheels but mostly we have the trailers there whether it’s for a boat or any other trailer. With electric impacts no reason to not be able to change them unless they don’t have room for a trailer.