Craig,
Since you are soliciting opinions, here's mine. We are getting rid of our fifth wheel and getting a tag-along (called a travel trailer in the industry) for most of the reasons that have been mentioned here. One more reason to favor travel trailers that has not been mentioned is that when you get to your destination and unhitch, you have a normal truck without a big, space-robbing hitch in the bed.
The biggest advantage to the fifth wheel is the fact that the hitch pivots at the rear axle and thus side loads on the trailer affect the truck much less (virtually not at all). Fifth wheel trailers also have large hitch weights, indicating an inherently stable trailer (more below). The advantage to the travel trailer for me is that I don't have to remove the cap from the back of the truck, nor give up all that carrying capacity.
If you load the travel trailer properly, with the center of gravity well ahead of the trailer axles, you will notice two things. First, you will have a large hitch weight, indicating the forward CG. Second, your trailer will be inherently stable while towing. That is, it will not tend to sway from side to side excessively. Some trailers are easier to load properly than others. I depends on water and waste tank location, cabinet location, etc.
I have not towed our new travel trailer much yet — so far just one trip from Georgia to Indiana — but I don't expect any problems. If I find that ours is difficult to load properly, with sufficient hitch weight, we will invest in the Pulliam Pull- Rite hitch rather than switch back to a fifth wheel trailer. The Pull-Rite pivots just behind the truck's rear axle and helps prevent the sway problems that you can get with an unstable travel trailer. If you call them (Pulliam Enterprises at 800- 443-2307), they will send you a video explaining their hitch.
I want to be able to hook up the trailer on a whim and take off for a weekend or so without making a major operation out of it. With the cap on the truck, that was impossible with the fifth wheel trailer. Not only did we have to remove and store the cap, but we also had to install the fifth wheel hitch. I never left the hitch installed with the cap on the truck; it took up too much bed space. I'm looking forward to the convenience of the new travel trailer.
Loren
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2000 Quad Cab, 4x4, short bed, six-speed: U. S. Gear exhaust brake, MileMarker Select Drive viscous coupling, Velvet-Ride spring shackles, Painless Wiring circuit box, Optima yellow-top batteries, Super-Glide 5th wheel hitch, Reese folding ball gooseneck hitch, Drawtite front hitch receiver, Tekonsha Sentinel brake controller, Westin nerf bars, Clarion sound system
1995 Standard Cab, 4x4, long bed, automatic: Firestone Ride-Rite air springs, torque converter lock-up switch, 4" cat-back exhaust, Reese 20K 5th wheel hitch, Reese gooseneck hitch, Hayes Micro Control trailer brake controller, 100 gallon bed-mounted fuel tank with 12 volt electric pump & fill nozzle, Swiss Cap fiberglass cap