All they will be looking for is a competent drive, nothing special. The tanker should be empty when they take you out, to make gears and maneuverability a bit more steady.
Overall tankers are pretty easy to drive, probably more so than curtain siders astley they are not as tall and about 6 feet shorter in length.
The only thing to get used to is the weight difference between a loaded and unloaded tank, as 99% of the time you will be either empty or full weight with no in between (so running at 14 then 44 tonnes, then back to 14 with no in between, unlike with sides sides where weight can be pretty variable)
Just take it slow and steady, especially when loaded, as the controls will be less responsive and your load will move, even in a baffled tank
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