How long is your Kayak? Ours are too long (14+ feet) to mount vertically and we usually take a 16.5 foot canoe with us also so we've used a trailer for years. When taking the motorcycles the kayaks move to the top the top and the lower cross bars are removed for the bikes.
2006 Fleetwood Tioga 26Q
Toads: '15 Ford Focus, '10 Harley Softail Custom and '15 Harley Softail Deluxe
Upstate (the other) New York