It took me 3 years of on and off play to 100% Michigan, took me about 3 months of on and off play to 100% Alaska. It was so nice to have a fleet of trucks from this century rather than those dinosaurs in Michigan. I'm trying to limit myself to 5 trucks per region (plus my scout). Buy trucks at the beginning of the map and use those. And found trucks can be used, but are usually sold.
CAT CT681: This is the only truck I had to throw chains on because this thing is just so dang fast. Decided to try out the hydrolift long log trailer and it was actually really fun. The pusher actually helped with stability when it was folded, but this is also the only truck in all of Alaska I actually flipped due to how too heavy the truck is with the trailer folded (damn you White Valley sawmill).
CAT 745C: This thing is a beast. Pulled all the oil rig trailers without any complaint at all. And the few times I had to use it as a rescue truck it worked perfectly.
Western Star 6900 XD: After a few missions in this thing I could tell it was a bit OP for Alaska, so I handicapped myself and only used it when I absolutely need it. The crane being at the back was a neat detail with this truck.
Freightliner FLD120: Loved this thing. Wasn't OP, has a sleeper, and never gave me a guff. Great truck.
RNG WL500: I originally downloaded this to clear the rocks from the road in North Port, but that didn't end up working so it just sat in the garage. When I tipped the CT681 with a full load of logs, it came to the rescue.
Alaska was fun, felt much easier than Michigan. Now I'm hopping in my van and driving over to British Columbia where I'm told I have a fleet of Cold War Era military trucks to help out with the recent storm. Oh joy.