does full coverage insure whats inside the trailer? Does that only apply to enclosed trailers? $66 is cheap insurance it seems with all the theftsHey, I work for a insurance company, if the truck has full coverage the trailer will be covered while being towed, if it only has liability it will only cover if the trailer hurts someone, like comes loose from the truck. Trailer is not covered for theft and vehicle on trailer is not covered unless it has its own insurance. I would suggest getting insurance on the trailer, I have a 28ft enclosed insurrance for a year for it is only 66.00. That puts full coverage on it.