question about 85 suburban tailgate. non barn door model

[jasonroman]

I'm going to look at an 85 suburban. guy told me the only issue aside from a little rust here and there, which is expected in jersey from an 85 chevy.
the issue is the tailgate. says glass is good and works, but something under the truck that supports the weight of the truck is gone. i guess rusted out, or whatever. i am not sure what he is talking about, I'm eager to get back into a square burb. just wondering whats ahead of me if i do go ahead and buy this truck.

anyone have experience or answer to what id need to do the fix .
appreciate any help here.