What do you look for in a forklift?

Our propane Clark (solid rubber tires, Don't get it out in the dirt!) had two tanks. One on the fork, a full spare to change in when necessary. Three minutes downtime. If we put the second one on, the first went straight out to get filled. And we used it three days out of five, for forty years. Used indoors and out for all that time.
( and if my depth perception wasn't such garbage, I could still make good money driving one at one of the big warehouses.)