Just finished my setup.
A 600 lb aluminum motorcycle carrier on 2 receivers bolted to the frame rails and hitch with 4 grade 8 bolts per side.
Behind that - an 8" solid shank hitch extension and a hitch mounted bicycle rack.
I added a light at the end of the bike rack for run/brakes and flashers.
Total weight- motorcycle and rack- 500 lbs
Bicycles and rack- 100
I just tested it on a 300 mile trip.
No issues. MH rode great-probably better now that I added 600 lbs to the rear of a 14k gross chassis with only 10,800 on it
No bumping or scratches of any part.
Takes 30 minutes to load it all but no trailer.