I live in Colo Springs at 7000'. I would not go bigger than 31s on a stock-geared FJ60. You will lose too much low-range gearing with 33s at higher elevations - you will run out of gear and power, both. I would also not add a ton of weight to your FJ60 (bumpers, gas tanks, tires, spares, etc.) as they have enough trouble lugging their own fat butt around. I recall towing my pop-up camper up Raton pass at 29 mph in 2nd gear, passing only a clagged out VW bus.
so, for me -
Galley plug
Springs with arch (rebuild OEM or go OME)
31x10.5 tires
LED interior lights
Lots of PM to drive up reliability
so, for me -
Galley plug
Springs with arch (rebuild OEM or go OME)
31x10.5 tires
LED interior lights
Lots of PM to drive up reliability