It depends on what you consider an oversized tire, I run tread that's just an inch larger than stock. I think that could limp home on asphalt with the temp spare. Yet I'd hate to think about getting off a fierce trail with that spare on. VXKat, do you keep that full-size spare on all the time, or just for the trail? I ask her as I have the same size, make, & model of tires as she has.
At least the VX spare tire storage makes for a great subwoofer box.
I think that a step to have better access to the cartop cargo rack is a good idea, however, I prefer the one etrailer has. It's a half-moon tube bumper with integrated pull-out step. It fits in either a 2" or 1-1/4" receiver hitch, available with or without led brake light. I think it'll look good on the VX. It's functional with the step, and also would act as a bumper to protect the cladding. I've got a brush gaurd for protection up front, why not add some protection to the rear?