Welcome OD, You have gotten some great suggestions, but I think one thing that might help clarify what everyone is saying is, when suggesting looking at all brands that might come up for sale
. Rather than narrowing your search for just 3 brands, because,
The brands you have chosen are somewhat less available than other brands out there. In the several years I have been around Glass, I have seen very few Havasu's come up for sale
(maybe 1 or 2) Compact Jr's are certainly more available and Beachcombers are a little like Havasu's. You don't see them come up for sale
all that often. Though I have seen more Beachcombers for sale than Havasu's.
But I certainly wouldn't pin my retirement dreams on finding only those 3 types of trailers. And because they are less available you will find fewer opinions about them. Many of us have never seen them in person (only drool over them when a lucky owner post a pic or two). It's not that you won't find one of your perfect "3" but most likely won't be in road worth condition if and when you do, unless you get extremely LUCKY!
As for fulltiming
without a bathroom, is it really the way you want to go? I realize that you didn't ask for an opinion on bathrooms, but! Cold nights even in Oregon finding the outhouse doesn't sound like fun to me. Certainly just my opinion, but having been an rv-er most of my life I truly can't see how you could "full time" without your own facility.
Retirement is suppose to be enjoyable and comfortable. Of course it's about what makes you comfortable. I don't want to tell you how to prepare for your retirement, but would suggest expanding your search field. Personally I don't think you can go wrong with any "glass" trailer unless it isn't the right trailer. But the glass world does have options that will work great for a single rv-er fulltiming
. Best of Luck!