I've only "had" to use the slider 4 times in ten years but would not be without it anyhow. There was one time we were in a so-called pull-thru. Long story but we could not back out the way we came in, had to go forward onto a very narrow lane with big trees on each corner of our narrow site. Without the slider we would not likely have been able to get out of the site. On the other three situations we needed the slider to get into the sites but we could have just chosen a different site if no slider.
If you can swing the $$ I'd recommend the superglide others mentioned. If not, then a manual will serve you just fine but with risk of crashing truck to trailer should you forget to slide the slider.
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