Is there a valid reason to carry the extra weight of spare tire? Will roadside assistance show up with tire mounted to wheel and then change it? There is no way I could change it myself.
First you have to ask yourself if you are physically capable of changing a tire. If not, then your question is answered. If you are capable, I would carry a spare. On a class A, get a VERY big breaker bar and socket so you can get good leverage to get the nut loose. On the bounder, my breaker bar is 3 ft. with a good quality socket. ALSO don't skimp on a very large sized bottle jack.