Florida Tanker

Regarding Praxair and Air Products. I hauled for both companies 20 years ago or so with a company called Logex.

I was qualified to haul virtually everything except liquid helium and hydrogen.

Praxair tends to really micro-manage their drivers. Air Products does too. Also Air Products will run you to the extent of your hours of service every week and if you're local you can pretty much forget about weekends off. That's how it was in the early 2000's I very much doubt it has improved at all in the drivers favor.
Sure, you'll make a good $$$ there just know what you're getting into. cryogenic liquids is a 24/7- 365 days a year industry, especially hauling oxygen to hospitals. I hauled O2 to virtually all the hospitals in the 5 boros of NYC, Long Island, NJ, CT, Philadelphia and Baltimore. It's easy work as far as loading and unloading goes but the schedule and destinations can be brutal.