I didn't know the width, plus, you have slide-outs. Do any of those go from the floor?
I thought some, the bottom of the slide is a couple of feet above the floor. If so, that adds to living space, I suppose but not floor space. Beats me, I don't have one, just pondering getting one.
I've never seen any slides in motorhomes that DON'T add floor space. I'm guessing here but maybe you don't realize when you see pictures of motorhomes from the OUTSIDE with the slides out that the bottom of the slides are the floor inside. The space you see BELOW the slides from the OUTSIDE is the outside storage area.
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Our dining room slide alone adds about 39 sq. ft. to the rig. By the time you add in the other three slides to the 38'x8.5' chassis, you have a unit that's bigger than a lot of NY apartments! And certainly has way more usable space!
As previously stated, many states have a regulation that defines an RV as less than 400 or 450 square feet. If it is bigger than that, it becomes a mobile home, which means it cannot get a vehicle license, cannot be driven on the highway, is taxed differently, etc.
In the past, we full timed in a 27 foot Class A, a 32 foot Class A, and a 32 foot fifth wheel with three slideouts.
The 27 footer was horrible, due to the floor plan. The 32 foot A was tolerable.
The 32 foot triple slide fifth wheel was by far the most comfortable, even in below freezing temperatures.
I would have no qualms about hitting the road full time in our present Tioga 29H Class C. DW says if we do that she wants one with a slide out. I tell her that in that case, I want one with a diesel!
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The allowable square footage, by code, for an RV (including Park Models) is 400 sq ft. A 45' motorhome with a 102" width (8.5 feet) would give you 382.5 sq ft BEFORE extending any slides. The amount of extra room you get with slides isn't huge, but believe me, opening up and being able to pass someone on the coach without having them pick their feet up is wonderful!
One way to get an appreciation is to go to an RV show and spend some time in different kinds of units.
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Slides DO have floor space, even if they are elevated a couple of inches off the main floor.
The calculation is NOT 45x8, but 45x (WHATEVER YOUR INTERIOR WIDTH IS)+ the width and length of each slide.
For example, my MH is 36 with 102" width. I measure from the front windshield to the back wall, then from wall to wall (inside). I have one slide that is 18" x 22'. I would add that to my calculations to give me the total square feet of livable space.
I don't know about a previous post's statement that if the footage is over 400 then it is a mobile home. I am pretty sure that there is a lot more involved than that in making it a mobile home. Not only that, but some of the higher end coaches have a lot more than 400 sq. ft. Yes, they require class B or Non-commercial Class A licenses, but that has nothing to do with living space.