Greetings M. Clarke!
Also the tV antena that comes with the trailer is tied down. Just wondered if these things come loose in travel. Can I untie it and travel and expect it to stay in place or should I use it and tie it up before moving? Or is it a lot less effort to simply use cable at camp sites?
It is not a common practice to "tie-down" the roof-mounted TV antenna. This is usually an indicator of a problem - - often indicative of a problem with the gears that operate the antenna. It is possible to buy replacement gears and most related parts from a well-stocked RV accessory store as the antenna was common throughout the industry and wasn't something peculiar to Airstreams.
It should be well worth the time and expense to repair the antenna as you can't count on campgrounds to offer cable TV. Only about 10% of the campgrounds that I have utilized in the past five years have offered cable, and those that did often had very limited channel choice that wasn't much better than that provided by a good antenna.
There are two strange looking bumps on the outside roof on the roadside of the trailer. Anyone know what these are for?
My suspicion is that what you are seeing are the plumbing vents for the waste water system in your coach. There are typically some type of "shroud" surrounding these - - and at times previous owners may have adapted unusual means of repairing this "shrouding" to solve a leak when they weren't aware of the availability of replacement waste vent fixtures with gaskets and screening.
Good luck with your Argosy!