I doubt if any of the Montanas are much over 400 square feet even with the slides out. I figured my 2850RK was right at 300 sq. ft. opened up.
Now, be aware you may not want to divide the price you paid for your rig by the square foot measurement unless you're sitting down! Although some say you can't take it with you, in this case I guess we can if we're hooked up!
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