Welcome Mark & Patrick!
Oh hey I just saw your other post and asked about how long you have left to serve...never mind!
You have a lot of time to research rigs. One of the most fun parts about our research was going to various RV shows and checking out floor plans. Even if you aren't going to buy new at least you'll see what you like and don't like in a rig. Look at every aspect of them, from sitting on the toilet to make sure the bathroom is large enough, to laying on the bed and seeing if you'll bump your head when you wake up in the morning. Seriously! Don't just look, play around with everything inside to make sure it's comfortable.
If you're new to RVing, and you aren't sure it will work, start cheap. You can always upgrade later. Although I tend to think that a small fiberglass trailer might make two people who haven't been together that long want to kill eachother after a while. Really small space like that, combined with the overall newness of life on the road, can be incredibly challenging. Just my personal thoughts though.
My husband and I have a 24' 5th wheel which some people think is really small but it's just right for us because we do a lot of off-road adventures with it and go places that larger rigs can't go. At some point I think we'll get a larger 5th wheel. We prefer this kind of setup because 1) fifth wheels are ALL living space, unlike a motorhome which needs room for the engine, and 2) you're only maintaining one engine, whereas with a moho you are taking care of two. Also, our rig really holds its value when combined with our Dodge 4x4 pickup. We don't always need a pickup but the 4wd is super handy and we love that it's there when we need it for hauling stuff. That's my argument for 5th wheels, take it for what it's worth.
Anyhow, good luck on your research, you're in for a lot of fun times. Thanks for joining us!