I dont know about solo cargo vans, but, solo straight truck drivers can make a decent living. Then again, what I may consider a decent living maybe pocket change for someone else.
The problem is that most carriers don't want a truck that can only move 11-hours down the road, they prefer 22-hours of driving down the road. Most owner/operators now have that same feeling, afterall, their truck payment is the same with a solo driver or a team so why not have it moving 22-hours a day down the road.
But, there are carriers out there that will take a solo truck on, once again I don't know about cargo vans, but some carriers are still taking solo straight trucks on.
I prefer driving solo, I have always made a decent living while driving solo, but I don't turn stuff down anymore, I go any and everywhere, I also picked up my hazmat to ensure I don't loose out on a load if I am in some low freight lane with 10 other trucks but they don't have hazmat.
I can tell you this, if you are an owner-operator of a straight truck, I would suggest calling Tran Stewart out of Osseo, Michigan; Load One out of Taylor, Michigan or C&M out of Ohio. I can tell you these companies take solo drivers or solo owner-operators.
IMO I would not run for any expedite company that is not a member of the Expedite Alliance. It is this alliance that sets various business standards for its members and also shares freight shipments within its membership, thus, as drivers increases our chances of obtaining quality good paying freight loads.