I talked extensively with several DOW officers about this very subject last year. You can shoot from a trailer of any kind as long as its not hooked to a vehicle. I was researching the rules and regs on shooting from a high rack in a pickup bed (like you can in Texas). The answer i got was "are you shooting from a motorized vehicle?" The officer then offered up info that shooting from a trailer detached from the pickup was legal, but it must be detached. I night hunt coyotes, on private ground, from a elevated shooting platform on a utility trailer. I call the DOW officer assigned to my area (99) every other Friday to inform him that i will be out night hunting this weekend. I've been doing this for just about a year now and haven't had a problem yet.