The rollers may seem impossible to adjust as they are screwed down, but I found a small ratcheting 90 degree screwdriver that did the trick. You can also jack up the slide some (I use blocking and bottle jacks) to take the weight off the rollers. I had to shim under my rollers to get them carrying equal weight.
2017 Forester 2291S
2015 Honda Accord on Master Tow Dolly