Get the Revolution (i.e. Sidewinder) as a factory installed option. If you are getting a good discount off MSRP, this is such cheap insurance and it works without any thought or effort on your part.
I personally have used short bed trucks since 1989, back when manual sliders, auto sliders, the Sidewinder or notched fiver caps had not even been developed. Now I have a manual slider that I never use. So, none of these improvements are required if you are careful. But again, the factory installed Revolution is such an inexpensive option and it also offers a small improvement in turning and backing characteristics. Maintenance is minimal, less than a manual or auto slider. Pivots out of the way when not in use and also pivots for hookup at sharp angles.
Larry Day, Texas Baptist Men volunteer
'13 Silverado LT 3500HD D/A CCSB 2wd, custom RKI bed
'11 Crossroads Cruiser 32MK loaded