Glad to read that it isn't "Bumper" but frame mounted receivers. Very common for the 4-inch "square tubing" (actually sheet metal) "Bumper" to tear at the brackets and fail, with only a spare tire!
You'll feel the change when the motorcycle's loaded up. Say you have a spec for "hitch weight." Could be 350#, 500#... That's on a Ball, right at the bumper. The bike could weigh 350, 500, but the carrier's going to shift it to the rear, providing leverage that loads rear axle more (and lightens front axle!) more than a trailer would.