Commercial trucks are big because they usually carry large cargo or equipments like concrete mixers, suction excavators. They require a lot of power and configuration in order to operate properly.
Most semi commercial trucks or delivery trucks can be 50 ft long.
I would advise you to check out Commercial Truck Trader. They offer listings for new and use heavy duty big sleeper trucks, along with light and medium duty trucks. They currently have over 62,000 trucks listed for sale! Check it out at: http://www.commercialtrucktrader.com/
Youl will want a commercial liability policy. This will cover you if you operate commercial trucks.
Chevrolet commercial trucks can be rented from many companies. Discount Car and Truck Rental as well as Enterprise offers many commercial trucks which one can rent. Many are Chevrolet box trucks.
According to GMC, their trucks "get the job done" so they would be good for commercial hauling. However, you should always comparison shop and take into account price, financing options, and warranties.
Ford's website has a run down of all the commercial trucks they offer: http://www.ford.com/commercial-trucks/. Look through the different models and find one that fits your needs!
There are two catagories of trucks that are well known for having big wheels. The first category is show trucks such as Bigfoot that are often referred to as Monster Trucks because they are so big. The second kind of trucks with huge wheels are specialized mining trucks that are huge and used to excavate coal and other resources from strip mines.
Estimates of 15.5 million trucks operate in the U.S.
Steam trucks looked like steam trains, with large engines. They had big iron wheels and smoky funnels. They were so big and heavy that they ruined the roads.
One can find commercial truck sales from the following sources: Canter, Trucks 2 Go, Truck Locator, Commercial Truck Trader, eBay, Ford Commercial Trucks, Truck Paper.
A commercial scale for trucks
quite small