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Well i've got a 72 so it's got the barn doors. Doing that to the tailgate wouldn't really make sense because when it drops down...well...goodbye cans
I don't carry a spare..

The problem I see with this logic is that when you do carry them full it will likely be on rougher roads so there will be more stress. Maybe it's just me but I'm more afraid of an empty gas can than a full one so I doubt I'd carry empties around for show.I have seen it done, and it did not seem to affect the alignment of the door. For the most part the cans travel empty, just for show. If they only travel with gas on the occasional excursion, the net effect would take a long time to show.
Have you considered mounting a second, plate type tire carrier on the other side of the truck to match the stock 72 on the pass side? I've seen that used as well, and it's a lot sturdier than the barn door for that weight.
Best
Mark A.
I carried a full 5 gal gas can in a GI can carrier mounted to the left barn door on my 68 FJ40 for over 15 years with no issues other than rattles. Door/hinges are plenty strong.
See post 96:
https://forum.ih8mud.com/40-55-series-tech/252729-fj40-pics-back-day-70s-80s-4.html

