It doesn't matter. The tailgate is strong enough even with one cable to take the weight of the ENTIRE bike while driving around as long as you don't go 4 wheeling with it sitting back there.
Don't be fooled. Honda knew that people would have to use the tailgate as a useable part of the bed when they built the truck due to the lack of length we have back there. Your truck has the strongest tailgate in the industry.
http://i101.photobucket.com/albums/m...7/IMG_0544.jpg
This picture was taken at the last ROC meet in St. Louis.