Questions to ask...
1. What % of their operating life are they no hooked up to a trailer?
2. When hooked up to a trailer, what % of losses can be attributed to rig/trailer gap?
3. What is the penalty for ridges oriented orthogonally to flow?
4. Of course, Cost v. benefit
I've seen the accordion stuff on trains/subways... But I think that's more of a trade off for turning....