Scott; think about how you are going to transport a 14 ft yak. I have a 6.5 ft bed on my truck and with the tailgate up, I put two 10.5 ft yaks in it and strap them down. A 14 ft would hang over too far.
If you have an 8 ft bed and drop the tailgate (10 ft), you will be ok.
marty
Threaded Mode