Congratulations on the winning (only) bid guys, beautiful part of the country, should be a great weekend.
Only thing I would suggest considering is the route distance.
Given the amount of faffing that goes on at every stop of an AR, 180 miles sounds a bit optimistic, and would probably represent 4-5 hours in the saddle realistically. Might be a bit much for some? (Personally, I wouldn't give a **** as I will be on my super-comfy explorer
)
Having been on a GM, and the North v South run years ago, I know that the roads are more than up to covering decent distances at "enthusiastic" speeds. It just gets a bit harder to do that safely when there are larger numbers.