Hey Randy,
I think from the replies that your getting the sense that the type of trailer that RV'ers pull is one of personal choice. I've had two 5'ers. The first was a 1989, 18. 5' gooseneck Sunline. I towed that with a Dodge Dakota with the 318 CI gasser, auto trans and 3. 55 rear. Loved that little trailer. Towed it home throught the front edge of a hurricane here in NH and never felt the wind want to take it off the road.
The second 5'er is a 27. 5', Trailharbor with the standard kingpin hitch. I use a Husky 16K manual slider that is removable from the bed. I tow this with my '04. 5 CTD, 6-speed, 4. 10 rear. My stump puller of a truck doesn't even know that 4. 5 tons of trailer is back there. Again, I've never had a problem towing this unit.
With both 5er units, I found that they were very stable in towing. Didn't matter whether it was wet or dry, windy or still air; they stuck right behind the truck where they belong. In talking to other campers, I've heard that 5er's are easier to back into a space when all the pull thru's are gone.
One thing that I've heard from campers who tow TT's is that the longer the wheelbase of the TV, the more stable the trailer will be on the road. I know I've seen some pretty awful alligator tails whipping onto the shoulder and into the next lane. They always seem to be towed by short wheel base Pick-ups and SUV's. There may be come truth in what I'm told.
Again, its your choice. Mine was a 5er on the advice of a long time friend who was also an owner/operator, big rig driver and a fellow RVer.
Best of luck in your search.
Mike