In bed fuel transfer tank question

I have a 25 gallon Enduraplas transfer tank. It just sits in the bed next to the cab in front of the hitch. It works well. Has a built in 12 volt pump and standard gas station style fill nozzle.
I've had it about 5 years no problems. I paid 1/2 of what they are priced at now.
I power it with a 12 volt jump box.

I have aluminum and it works fine. Inexpensive and good looking. Easy to fabricate with fill tubes and custom outlets plus custom dimensions. Square corners for maximum space utilization as opposed to poly. Not UV sensitive.

Transferflow 50 gal diesel tank, steel ( I think), 12v hand pump. Worked fine.

Considering it's going to be in the bed of the truck and subject to who-know-what impacts, sharp objects, etc., I wouldn't consider anything but aluminum. That's what mine is.

A lot of new construction boats are using poly or built in FRP fuel, water and black/gray tanks.

If you can get a correctly designed poly, it would be on lighter side like aluminum. The newest designs do expand in hot weather, contract in cooler weather. Some older designs will expand, not contract back.

Look up portable marine tanks to farther understand issues I'm talking about. Attwood has good info on their website. Where I work, we have portable transfer tanks to 50 gals for marine use. They have wheels, hose, nozzle, and need a foot pump, or small 12v battery, like a U1 size, to operate.

I've been using poly portable1-5 gal tanks for 30 years with no issues. I have no use in the past, or current future use. I would consider a poly before a steel. No aluminum tanks to my knowledge.

Marty