IMHO it's both, real and homemade.
It doesn't have the looks of traditional firetrucks of that period. The condition of the wood looks to be newer than 90+ years old. However, It could have been made up at any time over the years by anyone. It could have been homemade back in the 20's and well cared for.
I can only guess.
Well,it could have been bought as a chassis by a small town,and built by some local folks for the community to use. Our fire department started that way. Mechanics and other folks built the first 2 tankers.
I had a uncle who owned a gas station in Perry for many years.At the price i doubt if you could go wrong.Bud in Wheeler,Mi.
Shop built locally. Pretty nice truck for the
money. Has an accessory drive. Has been for
sale for a while. Very well built. Jerry Van and
myself saw it last August. Construction appeared
Bud is right. The price is right.
Looks like Las Vegas's first engine powered apparatus. They had a local wagon builder make the body & hose bed.