Jim, didn't catch whether you both ride 2 up or each have a bike. About all I do is camp on these runs/rallies and have it down to a science. I use a small tent and one of those miniture sleeping bags. You can get a down bag good to 30 degree that is the size of a football. I order most of my stuff from either the REI Outlet store, Seirra Trading Post or from eBay. I just got an REI Camp Thermorest (large 3" thick) for $15!!!
But I have to change my strategy if my wife goes along. I have two sissybar packs, a large Saddlemen and a smaller T-Bag. I can't carry the camp chairs with the wife on but usually I have someone that isn't carrying a passenger who hauls them for me. When I do Sturgis I ship all the gear there as the Buffalo Chip has a shipping service on site. With this I'm able to send a larger tent with inflatable matteress and other gear like a camp stove for coffee and such.
I guess is just comes down to how comfortable you want to be.
Here is a pic of my gear: