My tank is in the cab, and I have no problems. I think the biggest complaints come from the aftermarket poly tanks. They apparently never seal right and you will get the gasoline smell in the cab. Second biggest complaint is from people that "desmog" their rig and end up not venting the tank correctly. If you are reinstalling the stock fuel system (tank and lines), I wouldn't worry about it.
Good luck!
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'71 fj40 w/ 23k miles, carb rebuilt and ported by 65swb45, SOR 2 piece header, vacuum advance w/ pertronix, Hell Creek 4" lift w/ homemade shackles sitting on 33s, front disk conversion.
ROTW
"Yeah, we're runnin' a little bit hot tonight. I can barely see the road from the heat comin' off. I reach down between my legs n' ease the seat back. She's runnin', I'm flyin'!"