I will attempt to answer this. If anyone finds what I write incorrect, correct me please.
OK first the magic figure is 10,000 pounds GVW. Remember that.
The second thing is anything under 10,000 lbs GVW generally don’t have to log or scale in most states. I know that Kentucky does require any commercial vehicle to scale. I know there is a state or two that do require logs, I forget which ones.
Now renting a truck, forget about it. The problem with that is that you have to have those infamous numbers on the side of the truck to haul any freight other than your own personal property and a rental agency will not allow that at all. They have to be you numbers, not the rental agency’s numbers. What I understand is required is that you have control of the assets, the truck, that you use to haul freight, which means a lease, contract to use or you own the truck in order to get these numbers. These numbers are your authority to do business hauling freight for profit. Someone else can answer what that is all about and how to get it. I would explain further if I knew, sorry.
The other factor involved is insurance, I would recommend you search this site for that information. Without insurance you shouldn’t haul a thing and actually may get caught and lose everything.
As for a b or c unit, I run a b unit and love it. But with that said, I have seen a couple really cool c units that also have a sleeper and are under 10,000 lbs. they can’t take the 3000 lbs loads I can take, but the room they have in the cargo area makes up for it. I guess the best of both worlds is the sprinter. A 158 WB high top sprinter is an excellent choice.
As a side bar, D-C is considering importing the Vario cargo van, which can haul up to 16,000 lbs with a choice of engines and transmissions. I drove one and I liked it but D-C needs to work on the parts distribution before anyone considers it.
Hope this helps.