The answer has more to do with how observant the OP is under pressure. The auto slider gives you more leeway. If he is a very diligent man, he may always be able to change the situation and avoid hitting without a slider.
Every truck + fiver + driver combination provides different results and opinions. Personally, I think it should be based mostly off driver comfort over anything else. Do you want to run the risk of being the guy that posts the picture of the cab dent and busted rear window? Chance of it happening are higher if you don't have a slider.
I've been running a Superglide for 9 years, no regrets. If I were doing it all over, it would be a tough choice between the Superglide and a sidewinder. But the Superglide will work with the Moreryde pin box, so that may sway it.
It's your decision, you have to decide what is best for you!
