missing eyebolt on front corner of camper

I am definitely a newbie to the camper world. The camper is a Dreamer(?), 1978 vintage. The wood the bolt pulled out of is pretty crumbly, means wood frame? The other bolts are tight, however, I am apprehensive to undo one to determine if it is bolt or screw. I am not able to find a way to access from inside to see if "nuts" are involved. (sorry, my attempt to be lighthearted) The attaching spaced out angle brackets sounds intriguing. Does that mean that screwing lag type bolts into wood of camper is accepted and possible and suitable for securing? thank you in advance!