There are conversion kits you can buy from Thule and Yakima, but they are upwards of $40 and clip on to an existing rack system. If you want to mount to a truck bed or SUV floor, then you need to buy two components, totaling ~$80. I went to two local bike shops and a specialty rack shop and no one had what I was looking for so I decided to make a quick stop by the local hardware store and design this on the fly.
Step 1: Parts List
My Parts List:
(1) 1/2" diameter, Galvanized pipe "T"
(1) Base / pedestal floor mount
(2) 1/2" diameter Galvanized pipe, 1" in length (you the actual length depends on how tight you wrench it together and how much slop you want.
(1) 1/2" diameter, 2" length (this can vary a few inches depending how high you want it to be, keep it lower for less stress on the part.
(1) Base wood stand (I had a piece of 3/4 plywood (4" wide x 34" long) around so I used that. You could use a 2"x6" if you want. I would keep it at least 36 wide so stays flat on the SUV or truck floor.
(4) 3/4" wood screws
(1) Paint (optional)
(1) Fabric (optional, but it sure makes it look nice)
(1) length of 4" wide, 36" long male Velcro
(1) Spray adhesive (optional, used if you decide to cover the base with fabric)