I have a 2010 tundra DC with 6.5' bed. Installed Reese 16k slider for my wildcat fiver, even after being told I wouldn't need it. Being a newby, I didn't want to risk it. I now tow a rockwood fiver and have never needed the slider with either. I think front cap shape played a lot in me not needing it with the wildcat and the rockwood has a Reese revolution (sidewinder).
2013 Rockwood 8282WS
Reese Revolution Pin, Reese 16K
2008 Tundra Limited Double Cab 5.7L
Air Lift 5000 w/Wireless Air