Let’s do some simple back-of-the-envelope math. How much would it cost to retrofit a trailer? The current estimated cost would be: Rear guard $ 500 AngelWing Side guard $2,900 Equipment total $3,400 (TrailerGuard SafetySkirt side/rear underride protection system estimate $2,500) Estimated years of service for a trailer = 15 years $3,400/15 years = $227/yr $227 … Continue reading Back-of-the-Envelope Math for Underride Protection Retrofit Cost/Trailer Equation