I should have warned you ahead to expect that. Even when buying new, there's always something. We had to have the propane storage door replaced because it had a lot of rust on it, then it took the service guy forever to install the wiring (he wasn't familiar with Dodge truck).
The best part is that it's home, yours and you have many adventurers to look forward to. No matter if it wasn't cleaned, you can clean it to your standards, it makes it truly yours then. Enjoy, and show us pics! Looking forward to your first trip report!