Here is a pic of my set up.
Its just a cheap "ranch bike" and way lighter than a single dual sport.
Along with the hitch mount I usually carry 10 gal of fuel, 10 gal of water, full tool box, chain saws, and timber gear in the bed.
My road is a good 30 minute 4x4 high range trail before getting to the cabin and I have bottomed this set up out a few times when I start to get in "rally" mode.
Even if the receiver weight limit and the carrier is in spec, two bike would not make it off road without damage.
Seems risky to me.
...Trailer time.