Get a diesel. Assuming you will be working on the rigs you will want a diesel truck. The lease roads are usually a mess, so getting in and out often requires a 4X4.
Why diesel? Everything on a oil rig is run off diesel (off road diesel) and it is not uncommon for rig hands to borrow a bit for personal use. Just don't get caught running down the road on untaxed fuel. Unless Canada is much more strict, you are not likely to get your fuel tested in a personal vehicle.
Whatever you buy, make it somewhat disposable. The roads are hell on the cars or trucks, and the industry is boom and bust.
Kirk
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