There is a semi-rigid flex duct (often recommended for dryer vents) that is available in several sizes at Home Depot, Lowe's, Menard's, etc. That might work to keep the mice out, make gradual turns, and flex during transport. Worth looking into.
2013 Eagle 266RKS
2011 Ford F-150 w/3.5L Ecoboost & H.D. Tow Package