Hey Don,
I must have misunderstood your plan to go west. I thought you were going to do the old school backpack/puptent/sleeping bag style and leave the CTC at home. Why would ya? Some kind of personal challenge to prove you are still a young Lion,... No thanks! So this makes a lot more sense to me now.
Anywhooo, If you know definite dates you will be in the black hills area I highly recommend camping at Custer State Park for awhile and you can make reservations 1 year in advance. Its a great place to base from and then ride to the other attractions in the area. You will have some full days of riding and possibly some late nights depending on your entertainment choices and weather etc. but that is all part of the adventure. I trailered the Harley from Montana and still put on over 600 miles between Custer, Black Hills and Sturgis. Other state parks in South Dakota can make reservations 90 days in advance. There are lots of KOA's and similar type facilities also, not sure about BLM in S.D. but there is a lot in Montana. You may also want to look into the Hewlitt/Sundance/Aladin Wyoming areas. Pretty damn nice there also. The "Badlands" area is too cool to miss if you are in S.D.. I know this sounds like a lot and it is. But how many chances are you gonna get to see this part of the country?
Here is the link to Custer State Park.
https://gfp.sd.gov/csp-campgrounds/?gcl ... fcqavd_bwe Sturgis Rally is a week later than usual this year. The first Friday of Aug. is the 7th and it runs through the 16th. This is the 80th year so the crowds may be a bit more than last year. Let me know if you need any help and when you think you'll be there. I'll try to make reservations to be there then.
Coast to Coast with a trailer and a scoot.... Trip of a lifetime. Get off the Interstates and see the real America. You are gonna love it!
McDave