Mine slides great, with the weight on it (16k Reese) in low range, using the trailer brakes to hold the trailer in place. My problem is while in the manuevering position, I can manuever very little. If I turn at all, my extended box pin is into my tailgate or side rails at the rear of the box.
I should have saved some $s and purchased a "fixed" unit, the RV salesman talked me into the slider, said I would have clearence problems at my bumper and rear window while turning without it. Not true with my setup, I can turn a full 90* without any contact with my slider all the way forward.
Live and learn, I can barely lift this slider out of my box by myself, I would gladly trade someone for a 16k fixed unit in like condition, staight up.
Jess