Kayak Bike Trailer Need An Inexpensive Way To Make A Hitch To Connect To My Bike Seat Post, Or Other Part To Pull My Kayak. Ideas?

Need an inexpensive way to make a hitch to connect to my bike seat post, or other part to pull my kayak. Ideas? - kayak bike trailer

I have some ideas YouTube. I looked to hold a so-called dumb, but yours is made of steel. I thought the same idea with the PVC, but not sure if I have a possibility of a hole the size of his room by the drops on the seat post drills here. PVC tried some boards, such as elbows and "T" 's songs, but the seat slightly tilted at an angle making it to the edge of touch?