Having driven both TT's and my HTT which has a definite sloped front, I would have to say that there is not a significant difference in resistance. If there was a big difference, I would expect to use less gas towing. That is not the case. You also have the drag from width of the trailer which is six inches to a foot wider than the TV. The drag is quite substantial compared to an Airstream which is rounded all around the front face of the trailer.