We have an Allen rack and hauled three bikes on the back of our TM, probably 4000 miles or so. I bungy corded the bikes down firmly and the Allen rack has a locking bolt that holds it down in the receiver. We noticed no problems at all.
Of course this was on two light adult bikes and one kid's BMX style bike, I doubt all three of them weighed 45 pounds. The rack is fairly heavy, I'd guess 20-25 pounds or so.
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