We have been in C units for the past 4 years, and have one available if you're interested. We like them because we seldom share a location with another C truck, usually get first crack at long B loads and C loads that D trucks don't want, buy fuel where its cheapest (no fuel taxes), park in just about any space (smaller), cheaper on fuel (less weight), tires, repairs (seldom carry over 1000 lbs) and cheaper to buy.
We'll run in NE anytime we can and usually stay busy. Lately, wherever we run we've stayed busy but NE is nicer weather wise.
If you like to sit in truckstops, get a D. Lots more of them out there, so when you check in for your next run, you could be behind as many as 11, although usually its 3 or 4.
Our next new truck will be a C.
Vernon