I've never heard of anyone having a warranty issue refused for "properly installing a safe/adequate hitch assembly" to their RV. It's pretty much an understood that you can't "push the darn thing" so a hitch is a requirement.
Now, if there were an issue caused by the drilled holes, that might well be something to take up with the installer, not with Keystone.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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