truth be told the hardest part is getting the my 35s (soon to be 37s) back on the hub, even the spare is easier to put back on imo, I'm considering getting this, which will make the one wheel at a time even easier
sooo, you have a spare, so lift one wheel at a time replace with spare, lower, lift next, replace with wheel you just took off, repeat, no need to remove all wheels at the same time.
I agree with most here, Ive bent, scratched, even mangled my skids, I do take them off from time to time to clean the inside of dirt and give the rusted parts a little spray of this (don't care if the color matches perfectly)