Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us.
Rear end separation is, unfortunately, some common on older larger Aistreams. Remember that there are many 30, 40, and 50 year old Airstreams still running the highways. There aren't any other trailers that old around to to have their tails separate.
There's a lot of good information on this issue on these Forums.
You have have better luck searching on Google using the words Airstream Forums and tail or rear end separation.
Good luck with your project.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)