I think what the original poster was having trouble with is that his D-rings are to far forward on his trailer (relative to the car when loaded in the correct position). When he loads his Viper and puts one end of the strap in his frame slot and the other end in the D-ring, it pulls up against the lower edge of his front fascia when tightened. The front fascia is so low and long on our Vipers, that it is tough to miss.
Really three options:
1) The wheel straps which he asked about. Many good resons have been posted for not using these.
2) Putting in D-rings in the correct location for the Viper. This might still result in hitting the underside of the fascia with the strap, at least it does on my trailer which does have the D-rings mounted specifically for hauling Vipers.
3) Put another D-ring in a so that he can run the strap through the additional D-ring and then up to the frame slot, while connecting the other end of the strap to the original D-ring.