Yes, but you can't drive it.
You'll need to complete a training course to obtain a commercial drivers license (CDL) then either buy a truck and become an O/O or apply at a trucking company.
Not necessarily, although you do need the appropriate class licence to actually operate it. You can operate anything up to 26,000 lbs. GVWR on a standard Class C licence. Anything above that, you either need a non-CDL Class B or A licence, or a Class A or B CDL, depending on what type of truck it is specifically, and if its use permits it to fall within any of the exceptions for requiring an actual CDL (registered farm vehicle, etc).
Allstate is your best bet for commercial truck insurance.
You can go to dmv.com to search for commercial truck insurance.
Commercial truck parts can be ordered in from your local mechanic. You can also buy them on line at www.highwayandheavyparts.com/ or at truckparts.org/
Commercial truck trader is kind of like a "super shopper" for commercial vehicles where you can buy and sell trucks with others. Check out the site it has a great deal of info!
If you are looking for a commercial truck to buy, what better place to look than on commercialtrucktrader.com? They specialize in all types of trucks, new or used.
You can buy a good commercial truck dealer equipment at home depot! Not only is it located in various areas, but the workers there know what they are talking about and usually has great customer service.
In order to get a truck you either need to buy it from a private dealer or a certified dealer.
Try a big truck dealer, in there parts dept
The CDL handbook is provided free of charge by the DMV.