All of mine are old school. Kept out of sunlight to cut UV degradation, and still work fine. The new ones are a mess, though.
Well of course they are. without a vent they're heaving with the heat and cold all the time.
I still have my trailer from the lawn service days, but the 25 gallon steel gas tank is gone... the one with the DC pump with a 3/8 line for filling all the small equipment... that was the way to go. a nice gas handle at the end with a lever... I want it back I might just have to make me another one.