About two months ago, a game warden talked to a group of gopher shooters in California, he advised that recent F&G laws prohibitted shooting FROM a trailer that was still attached to a motorized vehicle...he said that it would be the same as shooting from a motor vehicle. To be legal, the trailer had to be disconnected from the motor vehicle towing it. Don't know where you are from, but it might be worthwhile to check ( closely ) hunting regs to avoid a possible problem
Mark