Class C 23-24 foot motor homes
I have an 01 Four Winds 23 foot model with slideout, so I am familiar with the floorplan (although not the specifics of the Tioga or Jamboree). We've traveled twice between the East Coast and Alaska in ours, and many side trips in between, with 2-3 kids.
Advantages of this floorplan is that it is quite open--you are using just about the entire volume for living during the day, or sleeping at night. Other smaller class C's with walled-off sleeping areas seem far more cramped in comparison. The vehicle's size is small enough that, if you have a median or something to hang the motorhome's rear end over, you can back this into a single parking space. The slideout adds considerable volume and spaciousness when parked, but the slideout walls can make it seem a little cramped with the slideout retracted, and the slideout mechanism takes up valuable outside storage space.
Another advantage of these designs is that they typically have close to 3000 lbs of excess weight carrying capacity, so you can load them up and travel with full tanks without overloading the chassis (some larger units, particularly 29-31 foot class C's, are close to the limit while empty, let alone loaded down).
Disadvantages of this floorplan are twofold. The first is the scarcity of outside storage space. We ended up putting a Remora pod (
www.letsgoaero.com) on the back of ours to help with this. Figure you've got to find place for firewood, a grill, fishing rods and gear, lawn chairs, toys for the kids, leveling blocks, wheel chocks, etc.
The second disadvantage is the flipside of the open design, in that, except for the cab over sleeper, you have to reconfigure things to sleep. If you're going to be sleeping more than 2 people, consider a good air mattress (in ours, the foldout bed in the couch is rather uncomfortable, and runs the entire width of the floor; and the dinette makes for a rather short bunk).
To really make this floorplan work, you need to be able to use the cab over as the primary bunk. When we bought ours, the bunk headroom in the Four Winds was considerably more than the other brands we looked at.
Another problem is endemic to all class C's--namely limited outside visibility. You have somewhat obscured visibility out of the two front seats, due to the cab over hanging over your head(s), and visibility for passengers in the rear is poor--they can see out one side, but not well out the front.
All class C's get lousy gas mileage. Depending on your speed, don't expect much over 9 MPG, we typically see 7.5 to 8.5. A 23 footer gets about the same mileage as a 29 footer.
From checking the Fleetwood website, the tankage on the two you are looking at seems adequate. Unfortunately, manufacturers tend to design these smaller units for the budget-minded buyer, so they'll cut some annoying corners. Check out the AC/DC electrical power distribution system, and see how many house batteries it has (one is not enough if you intend to stay in one place more than a night).
If there is any possible way you can rent a motorhome similar to the one you are thinking of buying for a weekend or so before making the purchase, I would highly recommend doing so.