If you plan on using it for 10 years you want a unit that has a proven track record for that long. Since you had a Sonnybrook, might I suggest Mr. Fought's new brand - DRV? Yes they are more money than either of the two your wife has looked at but the TKSB has the items she wants - two recliners across from the TV, fireplace, separate W/D, the single utility center with a convenient water manifold to shut off water if there is a problem, plenty of storage and you can get it in 37 (36) or 39 (38) feet lengths. It will require at least a 350, but I suggest a 450 (my choice) that will pull it with room to spare, some go to a MDT like a Volvo or Freightliner.
The advantages I chose were - bigger frame, wider body (8'6"), 8K axles, larger wheels and tires, MOR ride independent suspension, 2 ea. 40 lb. propane tanks (last a lot longer), 2ea. 15K A/C - heat pumps (save propane to a lower temperature) and electric dump valves to save time and effort, for got the level up system - push and forget, go do other hook ups while it does it's thing.
If it were me I'd choose the highest quality unit I could get from a dealer who does a great PDI.
