A number of companies (Zoic, Yakima, Thule, etc.) make a pad that attaches to the back of the truck and you can simply place your front tire over it and it will hold your bike securely.
A number of companies (Zoic, Yakima, Thule, etc.) make a pad that attaches to the back of the truck and you can simply place your front tire over it and it will hold your bike securely.