In previous discussions about the fit of levelling ramps, the distance between the axles of tandem-axle Escapes (at least before the 2016 design change) was found to be 30.5 inches. That's centre-to-centre of the wheels, which would be that same as centre-to-centre of the Torflex crossmembers (which are about 6" ahead of the wheel centres); if those are 2" square tubes, that would make the space between them 28.5".
If you're planning something for the space under the floor in the rear, keep in mind that there is a step in the frame and in the floor, and that the fresh water tank is near the front of that space.
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