Well I have a short bed truck now and I pulled the 5th wheel and runners, but I need to find a glider I think. Now my 5th wheel has a extended king pin box. Do I need the glider or not? The 5th wheel is a reese 16k.
I have a short bed and fifth wheel with a 12" extended pin box. I also have a Reese slider that has only been used a couple of times in the past 9 or 10 years or so. Both times I have used it was for extra caution and probably could have gotten by without it.
With a longer (21") pin box, I think you can get by without a slider. You just need to be aware of your clearances and use a bit of caution.
Jim
Now I can go camping...
Don't forget about paying for the truck