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If the tank has no evidence of serous rust or dents I can see no reason for replacing it.
The two things that I think prevents problems is when they are being filled that the bleeder should be open and a know quality of gas be added that will not over fill the tank.   I always let my go empty and fill with 2  gallons.

Ok. I've been reading a lot in the archives on options for the tank. My
plan was to remove all the fittings, refinish the tank with POR-15 and
fresh white paint, replace the regulator, shut off valve, and maybe the
fill valve. Bleeder valve looks good as does the fill valve but I noticed
that the rubber gasket in the inside end has a small gap in it. Anyway, I
see the new tanks offered by GW, BD, Van Cafe all have the additional
relief valve that the OEM tanks don't have. So let's get down to the brass
tacks (pun intended). Is the only real issue here the cost of a new tank?
Can a refurbished LP tank be just a good and complaint and a new one?(or
at least be grandfathered in) Do you still have issues with stations not
wanting to fill a NEW tank? I seems to me that the OEM tanks work just
fine as long as all the components are in good working order....so let's
hear from you!!! Do I refurbish or replace???

Peace, Nick