I got a quote from my dealer for a 16K SuperGlide on SuperRails when we ordered our 5th wheel - $3,000.00.
Found a 16K w/rails on Craigs List. Ordered the frame rails, wiring kit, capture plate and had a local shop do the install - $1,500.00.
Also got a quote from Camping World - $3,150.00.
Prices (new) seem to be in the $3,000.00 range.
Good luck with your adventure,
Allan
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Allan & Sadie
Bluemont, VA
2013 Cougar XLite 28SGS 5th Wheel
2013 Chevrolet 2500HD EC DMax/Ally, 3.73 gear 4x4