Welcome to JOF
Like "any" used RV a lot depends on how well the previous owner maintained it. I still have my 2005 Eagle (purchased new) and it continues to be a great TT. My Eagle has endured a lot of cross country road miles and extended stay use over the years. I did have a major roof/sidewall leak issue that was taken care of under warranty a couple years after my initial purchase.
Inspect the FW very carefully for any signs of moisture intrusion/damage. Classic signs of moisture damage are surface bubbles on the outer Filon (fiberglass) resulting in delamination, yellow stains on interior/exterior ceiling & wall surfaces, dimples on the ceiling surface, evidence of roof repair, etc.. Open up all interior cabinets/exterior storage areas and inspect using a flashlight......, don't forget to open/close the slide(s) taking notice to it's operation and fit when fully open/closed (inspect slide roof).
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)