The spare on my 1990 Winnebago Warrior is mounted to a rack on the rear of the RV.
With a 24-year-old RV, we absolutely carry Good Sam roadside assistance, and it has been hugely beneficial for us during break-downs before. Once when the heater core blew as we pulled into Disney, and another time when the fuel pump relays burned up, and then later when the fuel pump itself burned up.
The savings on towing is alone is worth the membership.
But they will also replace a flat with your spare. So I don't carry jacks or lug wrenches or the like. If we were to get a flat, I'd call Good Sam! :)
Steve