Despite the wheels being a bit of a task to find (although you can run it with 4 wheels only), there are a few issues I encountered which are related to the truck speed being nerfed too hard & misc:

Truck interior dials/panels are blurry, making them hard to read.

Trucks accelerate too slowly (this might be linked to the fact that although all the wheels were pristine, with 1 damaged and 1 worn, all wheels seemed to be sunken into the ground, similar to how trucks were in their initial implementation into the game...)

Trucks are affected much too heavily by the smallest of hills, even the slightest incline could take 10km/hr off your speed, which is significant if doesn't go that fast to begin with.

Trucks max out at 50km/hr currently, however it certainly does not feel like its going 50km/hr to me in comparison to 0.58 truck speed of 50km/hr (need more conclusive testing), and I do believe it should max out to 60km/hr I think instead of 50km/hr.