Totally.
And really, if you look at the set that I built compared to the MP bolt in ones, there isn't much difference. Biggest thing is that mine are 1.5"x 3" instead of 1"x 2" (I think). That does make a difference in cross sectional area, but the attachment points are still the same so it really it might not make that much of a difference.
MP's
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Mine. You can see they're wider as there's no step to overlay the rear frame rails, 3" is what you need there. And I made the rear landing plates bigger, to fit all the way up to the flange on the frame rail to floor connection. The front landing plates wrapped under the crossmember as well, more area, more dimensions covered.
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With the 1.5" tall tubing they sit right agains the floor under the footwells for the backseat, so, depending on rules they could be welded to a decent section of the floor which could help with torsional strength. You can also see my brake lines here are still in the stock location and pass over the top, so no issues passing the lines through the rails like on the weld to floor types like the US Cartool connectors.
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