They do not have a factory mount for the spare tire inside the bronco 2 as far as I know. I've never seen one, people just throw the tire in the back and call it good if they don't have the rear mount tire carrier. The B2's cargo area is already small, throw in a full size tire and you lose even more area, and if you actually have people sitting in the back seat your spare tire took up the rest of your cargo space. You definitely do not want that tire just sitting in the back of your vehicle, you get in a wreck that tire will make a great knock out device flying through your truck. The spare tire mount on the back outside I wouldn't trust it too much either. I'm thinking about buying a roof rack to put my tire up there and take the stupid tire carrier off the back before it breaks off, I think its aluminum so it would make for a nice amount of recyclable material LOL. I like the roof rack idea, plus if I ever find a deal on one and a roof storage box I'll do that, it makes more sense on an SUV than the tire carrier on the back in the way that you have to open before you can access the rear hatch, and if you aren't parked exactly level that tire carrier can swing back and hit you pretty good if there's a tire on it, trust me it hurts getting hit with one.
I plan on putting 215's on my B2 here this summer or fall so the tire weight will be even less than what it is now, and I don't trust that rear tire rack at all, not to mention the noise on rough roads. Oh, I also noticed that it creates a clearance problem with my trailer so the tire has got to go if I ever get the chance to go camping and take my travel trailer.
Building a carrier would be OK, if it wasn't for not having the equipment to do so, and I've seen some really nice home-built bumpers, tire carriers, and fuel can holder setups, especially for the offroad groups.
