I know transporting dogs in trailers (secured in crates) can be done safely; there are lots of examples of rescue groups and humane societies doing it. I think I would first look into a method for your dog to load up in your truck.
For those who like to quote survivability in trailers go look at the inside of tow vehicles after a crash and ask oneself where would the dog end up (especially those dogs that ride loose). Or look at motor homes after a crash or roll overs and ask where would the dog end up.
