I'm going to assume you'll be traveling north in the summer months and not the middle of winter???
Get one with slides - be comfortable. But, you should get one you can use with the slides closed if need be. By that I mean you need to be able to use the kitchen, use the bathroom and use the bedroom without any problems. We leave our slides in more when it's very hot out for better cooling, but have left them in at night when it's cold.
The interior of Canada and Alaska can be very warm during the summer months. Make sure you get a MH with two good working 15K air conditioners and a good dash air conditioner.
Bill
