aerodynamics

IMHO: More importantly is the protection built into the front of the trailer. So many new trailers have the fiberglass shell unprotected from road debris. It only takes one rock, or something else left on the roadway, to punch a hole through or crack the fiberglass shell. What I look for is the diamond plate protection. I have it and can tell you it has saved my trailer from serious damage on more than one occasion. I would not purchase a trailer without this protection. Period! Aerodynamics is a non issue with today's trailers.