I do not use the Sidewinder, as my P/U has an 8' bed. However, it is my understanding that the Sidewinder creates a secondary trailer pivot point to the rear of the king pin that is hitched in the bed of the truck. This allows the trailer to pivot BEHIND the rear axle on sharp turns without contacting the truck cab. However, the hitch weight of the trailer remains on the king pin, which is still directly over the rear axle. In other words, the Sidewinder pretty much eliminates the need for a slider hitch on a short bed P/U. Hope this helps.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.