I don't think that hauler is more than a few inches longer than the ordinary pickup unless that is the long wheelbase version of the C&C. Part of the reason for the cobbled bed section is the different frame size and shape of a C&C and the different location of the rear axle assembly. The added section in the front of the bed is not more than about 8" or 10", that's not much longer.
Wertles you were correct in questioning the validity of a fancy $70k truck for commercial hauling. The money is not there. Trucking for owner operators is a big risk for little return. Many of them go broke. Many RV transporters go broke unless they are driving Dodges with Cummins engines. If they know what they are doing, manage their loads, and carefully maintain their trucks keeping their expenses under control they can earn a modest living.
When I was transporting my good friend Bill Stockard pointed out to me, correctly, that trucking, of any kind, is one step forward then two steps back. There is no money in it.
I figured I was selling the value of a nice new Dodge Ram to the transport company I was leased to for about $1/mile and earning little to nothing for my time and work.
I transported for two years and nine months, ran 400k miles, and earned a gross income of about $225,000. That sounds like a hell of a lot of money, right? It does until you subtract expenses. My net income was about $35k or $40k/year if I didn't count the cost of buying and wearing out a good truck.
In my case it was a very valuable endeavor. I had income from other sources, my wife has a good job, and we had rental income coming in. Every dollar I earned transporting went straight home to my wife and she paid off mortgages on several rental properties I had bought on a shoe string. I paid all expenses out of other income so transporting was extra. The additional income from transporting put us way ahead financially. And it was a lot of fun. Every load, every trip was a new adventure and I enjoyed every day of it but would I go back and do it again? No.