We do have hitches available for campers like your 2019 Coachmen Viking LS Camper. These hitches mount to the frame, so you'll need to take that measurement into consideration.
I recommend the Curt Adjustable Class III, part # C13701. It adjusts from 18" to 51" and mounts to box frames, C-channel frames, or I-beam frames. It has a 2" receiver and can be bolted or welded on. I've linked to a video review of this below.
As for your bike rack, I was unable to find out if yours is compatible... view full answer...
Running 10 gauge wire like part # 10-1-1 from the 12 volt accessory pin of your trailer wiring to the battery's positive post is a great way to give it a maintenance charge while you are driving around. It won't charge a dead battery back to life but it will keep a battery topped off that's had moderate use.
Or we have roof top RV solar panel kits like part # 34272635 which will give you a way to keep the battery topped off as well as it can provide up to a 100 watt charge. I attached... view full answer...