Larry:
Well, a fellow Albertan!
We bought a Travelaire 23' lightweight 5th wheel recently (we live in Calgary and bought this unit in Lethbridge). Travelaire is a Red Deer company, and known for making decent stuff. I'm in the process of setting it up for winter camping. There are several campgrounds (Sandy McNabb, Mt. Kidd, Crimson Lake, and others) that are open all year around. We like the quiet, and if it ever snows this year, the cross-country skiing as well.
FWIW, here are a few observations:
If you will be doing a lot of traveling, then I have found a 5th wheel type to be very stable. They tend to be a bit heavier that travel trailers for the same interior dimensions, however. 5th's, in my limited opinion, just tow better. The disadvantage is that you have a 'half height' front bedroom unless you get one of those behemoths with a full-height front end. However, they push a lot of wind, and that will both slow you down, and suck up a lot of fuel.
Travel trailers don't tow quite as well, but they are not as tall, and you get a full-height bedroom by default. So, if you will travel a while they stay for a long time in one place, they may be a better option. They also leave the bed of your truck free for other items. I find a travel trailer easier to park as well, as the 'pivot point' is behind the axle of the truck, giving you some 'leverage' in putting the TT into a tight spot. I find the 5th harder that way as the pivot point is over the rear axle. You have to get the axle in just the right place to get the trailer in just the right place.
We bought a bunk model this time for reasons similar to you. Our daughter is at the age where she will be wanting her girlfriends to come with her from time to time. With the bunk model, the beds are always made up, and always available. Some models will have a double bed in the rear, with a single bunk overhead, and if you can give up some space in the bathroom to accomodate them, they are very practical.
Any floorplan with a hallway is a waste of space.
We travel mostly in the summer, so spend a lot of time outdoors. We aren't TV watchers either, so have always considered the living room sofa a bad idea in a trailer. Just wasted space.
So, there you have it. I'm not a frequent contributor here, but have been associated with this forum since the time when it was still part of CompuServe. You will find a lot of knowlegdeable people here that will be able to give you some good information. Welcome!
Frank.