I was told it was mid 50s when I bought it at an auction about 4 years ago. I figured the pictures would let somebody decide if it would work for them. The bed is approx. 50"X100". I used it to haul junk and rocks and branches to the landfill. I haven't needed it since retiring from Bullfrog farming last Oct.
frog farmer-I have been around a couple of those early 60's beds made into trailers in past. Frame forward of bed is the give away. BTW -- both of those trailers had the limited slip differential ! delky dave in wyo