They still are.
a bunch There are 15.5 million trucks in the US and 2 million of them are tractor trailers according to Truck-Info
That depends on the size of the tractor trailers (they come in different sizes/models). and how many roadways you will need to get them on/off the land.
Trailers vary in size.
The best place to look for tractor trailers for sale is on Truck Paper, a company that hosts used trucks and trailers around the world. Their website allows buyers to find listings of sellers selling tractor trailers.
The statutory height for most of the US is 13 feet, 6 inches. That's how tall your van trailers will typically be.
UPS currently has 94,600 ground vehicles in service
This site looks promising http://www.nexttruckonline.com/ they sell trucks, tractor trailers and accessories/maintenance items that you would need for your tractor trailer.
Repossessed tractor trailers can be purchased from some tractor trailer dealers. If the rig was previously financed by a bank, the bank repossessing it will try to sell the tractor trailer to a dealer before selling it to the public.
6 years
Most trailers are 102" wide. Anything beyond that requires an oversize permit.
There are several tire store in the area too choose from.You can find a limited selection of tires for tractor trailers in Milwaukee at Sears.