Couldn't you purchase a device like this to allow the use of a 2" rack?
The 3500 pound rating of that adapter is a PULLING load rating, but in actuality it will effectively DECREASE the tongue weight or load carrying capability of a 1 1/4" hitch because it increases force applied to your installed hitch by increasing the length of the bending moment/lever by moving the load (bike + rack) back 6 or so inches. The increased length at the rear also reduces "departure angle, making it more likely that your rack will drag on driveway and parking lot entrance "ramps".
It's also another joint to introduce potentially wobble, unless special pins/locking devices are used.
They have their place though, I've used one many times to move boat & car trailers around driveways or lots with a more nimble car as opposed to a full-size truck. They're also fine for moving empty or lightly loaded trailers short distances between locations but for carrying two ebikes (or even one) stuck further out from the back of a 1 1/4" hitch, no thanks.