What size bottle for easy mobility?

[DaveO]

Asphyxiation? The greater danger is probably taking a corner too fast, and the bottle sliding sideways in the truck, denting your quarterpanel outward from the inside. I'd say you're ahead at $85 to own a *full* bottle .

[Brian Ski]

Asphyxiation? The greater danger is probably taking a corner too fast, and the bottle sliding sideways in the truck, denting your quarterpanel outward from the inside.

then snapping the valve and shooting like an unguided missile down the road.

[everlastsupport]

For me, it depends on how close you can get the truck to your tanks. If you can backup close to them, go 250, roll them on the job if needed. If you have to carry them or roll them a lot, 150 would be best. Also, you can buy a cheap dolly and keep it in the truck too. The generator is more work than the tank for us.