A lot of people (and companies) buy new trucks every couple of years partially because of how taxes are treated for them in running a business. On top of that, sometimes image, and reliability are factors as well. Typically companies that run older fleets will have a truck or two in reserve as spares to make up for the more frequent repairs needed on most plow rigs.
Light duty trucks just are not built for running around with hundreds of pounds hanging off the front of the truck. Not over the axle line, but well in front of everything. CV joints, ball joints, wheel bearings are common "consumables" in a truck subjected to regular snow removal duties.
The light duty/homeowner level products end up using light duty components to keep the weight down, and it become easier to assume itcan handle more than they are built for - right up until you find the breaking point.
If you are prepared to replace these types of items on a much shorter schedule, then have fun. If not, then look to another solution.