I think those made after 12/11 had the mod. Quick way to check:
1. Where is the bed slide controller located - front compartment next to the intellijack controller - part of the mod
2. With the slide out if you see only 2 rollers - another part of the mod.
3. with the slide out you may be able to lift the end of the bed and fell the rollers - may take you a while to find them.
4. With the slide part of the way out you will be able to feel the 2 rollers under the head board end of the bed.
Picture sequence - rollers viewed with slide out, end of bed rollers, controller location and rollers under front of the bed.
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2017 Keystone Avalanche 320RS fifth wheel.
2011 Chevy Silverado 3500HD LTZ CCLB LML SRW 4X4
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