The use of a hitch adapter such as the Brophy Hitch Expander part # HTAD or part # HT5R will reduce the trailer hitch's capacity by 50%. Therefore, your new weight capacity is 100 lbs if using either of the above. The Curt Trailer Hitch Mounted Spare Tire Carrier part # c31006 weighs around 15 lbs therefore so long as the weight of your spare wheel/tire does not exceed 85 lbs then you will be okay to go ahead with this.
That said, I really don't see any other option to carry a spare wheel/tire... view full answer...
Yes a 23 foot camper cover like the part # 052963792638 that you referenced would work great on your 2020 Coachmen Orion that you measured at 23.75 feet including the ladder. When picking out a storage cover you would want to measure the length of the motorhome excluding the ladder which means this cover would match up well to your motorhome. view full answer...