The hitch drawbar or ball mount is the part that slides into the hitch receiver that has the trailer ball bolted to it. You'll need the ball mount if you plan on towing, but if you're only using the hitch as a mount for a hitch mounted accessory like a bike rack or cargo carrier, you won't need it.
If you need a ball mount that's compatible with the Curt Class I hitch, part # C11256, I'd recommend # 3592. For 1-7/8 inch trailer ball, use # 19260 or # 63845 for a 2 inch ball. For a trailer... view full answer...
Traveling on the highway will not cause any issues whatsoever for the Swagman XTC-2 TILT 2-Bike Rack # S64671.
There are no specific speed restrictions and the rack will stay secure in your hitch with its included pin and clip. I do recommend adding a lock to protect your investment, and it has the added benefit of being an anti-rattle device, the Locking Anti-Rattle, Threaded Hitch Pin for Swagman Hitch Racks # S64029.
In regards to the adapter bar, according to the manufacturer one... view full answer...