Out in the western states I seldom see a DRW truck unless it is towing a very heavy horse trailer. The DRW are usually ordered by the dealer with 2WD and with a regular cab or a crew cab. 80% of the trucks I see with a 5th wheel and everyone I know with a 5th wheel have SRW trucks.
Once you put the trailer in a space and unhook it from the truck most people want a SRW truck and the question then becomes which cab and whether to go with a short or long box. Most also go with 4WD.
The people I know who have done extensive towing with their SRW trucks have all praised the shock absorbing king pins like the ones from Trail-Air and others. DRW may be better is you don't have one of these but it is a poorer solution overall.
Where a DRW is needed is with a trailer weight in excess of 15,000 lbs. as the load on the rear tires is such that it needs to be handled by 4 tires.
