I was expecting a debate over whether or not one needs a spare, given recent discussion...
Interesting spare tire mount. I would have guessed that Phil had bought Steve & Sue's trailer, but it's not a TA:
(photo of spare mounted under front: Under-mount Spare Tire.JPG
In front of the pin box uses otherwise wasted space, without causing interference with the pickup cab. It's a hefty item to place up high, and adds directly to the pin weight, but if you have the capacity, why not? It's certainly structurally sound. I've seen photos of bikes carried there (which would
interfere with the cab in most cases), as well as generators (similar situation to the spare), and satellite TV dishes.