In the past, if a piece of equipment got too stuck and it would cost more to get it back than losing it, it was left to sink to the ground and/or corrode. Not anymore; These days you cannot abandon an item of equipment due to strict regulations. That doesn't mean it wasn't done. To this day, I know that a residential complex sitting on top of a bulldozer got stuck in the mud trying to clear that property. It wouldn't be hard to let it pass for a few days, weeks, months, and it would settle down enough to be buried.

There are two main types of modern timber trucks – those used on uneven ground and forest trails where they fall, and those used for transportation on regular highways and roads. [5] The suspension and tires of an all-terrain vehicle are particularly important, as roads in forests are bumpy and often temporary. Solid, low-pressure and high-pressure tires are used. Up to nine axles can be used to provide low ground pressure and good traction . 

Timber is often grown in hilly countries unsuitable for farming, and so a log truck's ability to climb a slope is essential. The steepness depends on the quality of the surface - mud and snow are more difficult to climb than gravel and soil. For a manageable slope, the speed will depend on the power of the truck. [7] Legal weight limits will vary by jurisdiction, but range from 80,000 to 88,000 pounds (36,300 to 39,900 kg) in the southern US states, for example - about 40 short tons (35.7 long tons; 36.3 t)