Yeah, there are scenarios in which a spare might be more of a hindrance than a help, but as a general rule, I want a spare.
This is a nuanced conversation without a lot of hard and fast rules. Everyone's situation and reasoning could be different, even from one wheeling trip to the next.
- Are you running 33" or smaller tires? No big deal either way, keep the spare or don't, it won't matter much either way in terms of what your rig can or can't do on the trail.
- Do you trailer your Jeep? Keep the spare on the trailer unless you're heading way out into the weeds from the trailhead.
- Do you daily drive your Jeep? Most of the issues you're likely to have on the road (nails, screws, debris, etc. causing a puncture) could be fixed with a plug kit, spare is optional.
- Do you do some pretty extreme wheeling which might rip the sidewall? Might be good to have a spare with you unless your trailer is walking distance away. Don't forget, you still gotta get that big-ass tire all the way back to wherever your Jeep is on the trail.
Mine is mounted in my tub with a JCR Prerunner mount.
I can remove the spare, and the mount, and put the rear seat back in if I want to. (Generally, this doesn't really happen, but could. When I trailer it down to TN in a few months for a wheeling trip there — friend's trailer — I might pull the tire out.)
When you get to 38" tires it's just too big to keep the tire on the tailgate. It's a bad place for it and the tire carrier adds a bunch more weight which is undesirable.
-JC