Nah its fine, As some photos have shown before, I work mostly on irrigation, so spend a fair bit of time dragging work hilux utes in and out of channels, head ditches, etc, bottoming out quite often due to carrying 205's of oil around (they are mobile workshops for laser buckets, scrapers, excavators, that sort of thing) and the spare tyre handles it alright, could probably do with some form of cross member like the old ones had, but they are going alright, the hilux utes out here have over 200,000km, and there haven't been any issues with the spares, all have trays, and we design the tailboard to either swing out for easy access, flip up, or a nice decent sized hole through there, we also use drills or something to get them up and down, makes it a lot easier
Mostly, we don't use them, as they all have another spare on the headboard too.