What is a tractor for pulling food grade tanker?

No but racks to get loaded under can have issues. Height issues.

 

Having a low or mid roof sleeper is a must. And a tractor with a sharp turning radius. Some of these plants were designed by people driving pickup trucks.
I have seen some loading racks where it would be impossible to get a high rise sleeper in to it.

 

There are weight restrictions on wide base singles in Canada. I know Manitoba for sure has lower weight limits than duals, but I don't think it would effect you for loads at or under 80k gross going back south.

Singles from what I hear are a nightmare in any sort of freezing temps. Aluminum wheels, disc breaks, smaller axles and smaller bunks would likely save you more weight than the singles do.

 

I have never seen a truck with them in BC.
Most trucks nowadays in BC are tri drives, 12 drive tires. I personally only buy tri drives now, with full lockers. The comment made earlier about high rise sleepers, depending on where you load it may or may not fit, but I wouldn't chance it if buying a truck, especially to pull tanker trailer where the trailer itself is so low there is no aerodynamic advantage to it. Many refineries are now bottom loading, and some make the driver leave and go into the shack and get started on the paperwork, you tell the staff in the shack what products in what holes, and the quantity you want. You then go back to your truck and hold behind the waiting line. When ready for you refinery employees have you park the truck in the slot indicated on your initial paperwork, they do the loading. You walk back to the shack and complete your paperwork and grab a coffee or whatever. The employee walks in with your tickets when done loading your truck, final paperwork is done, you take your 3 copies and leave. The last 500 loads of fuel I have hauled, I wasn't even given the option of loading myself.

 

I should add that I'm aware you are discussing a different type of tanker, but many loading places I see for various products have height restrictions.

 

What? You must be joking or a total over exaggeration. I drive an international auto for tanker outfit and none of this happen. But it does shift like an idiot.

 

No exaggeration at all. Didn't have that problem with the Volvo's though.
Company policy was to leave the terminal and turn right, then the interstate was about 3 blocks away. Problem is, when you turn right, you immediately have to climb a short hill, with a stop sign about halfway up. That's where the problem was. If you stopped, then you couldn't go forward again without coasting back to the bottom and get a running start. People in the residential area were complaining about trucks running the stop sign and couldn't understand why we were taking that risk.
Finally, the company let us turn left when we were leaving the terminal, which took us through a housing project with sharp turns, but we could finally reach the interstate without those pesky hills to deal with.