I have been watching Expedition Overland on Amazon lately, and for some random reason started reading this thread again. One thing Expedition Overland emphasized in their Alaska trip was to have 2 spare tires. You're in southeast Louisiana. I'm in Pensacola, FL. I just bought a 5th Trail Boss wheel and upgraded my spare to the 35s I'm running on all 4 corners. My OE 17" spare is sitting in my garage with no vehicle it can be used on. I'll give it to you for free. Send me PM if you're interested. I'm willing to drive as far as Mobile, Alabama if you want to meet up, otherwise you pay for shipping and I'll send it to you. There is a possibility I may end up in Baton Rouge for a few days in a couple months, but that's uncertain right now.
Regarding a jack platform, I recently decided to make one out of concern about how the OE bottle jack appears at its limit when used to change a flat tire. I took a 4"×4"×6' post, cut into 6 12" lengths and attached 3 of them together with 2 1/2"×10" hex bolts, 4 large flat washers, and 2 1/2" nuts in each jack base I created. I recessed the hardware to avoid accidentally snagging myself on it. This project gave me 2 jack bases for less than $25 total that measure approximately 12"×10.5"×3.5". It you lose them or they become damaged you don't have much to worry about. The 2 combined are slightly larger and a little heavier than a more expensive jack base commercially available, but imo more capable of handling the abuse of lifting and supporting our trucks while on uneven terrain.