My only caution about planning to charge in state parks is that unless the state has created a policy for EV charging, the local ranger may not be able to help you out and let you charge, short of just charging you the full overnight fee for a campsite. This has been my experience in Minnesota. It's not that they don't want to help, it's that they're a state institution and by law they can't do anything for which they have no policy. OTOH, private campgrounds can do whatever the owner wants, and usually they're quite friendly and more than happy to take a few dollars for an hour or two of charging. Purplewalt is correct, though: call ahead.
I made the trip successfully over the weekend, and learned a few things. I'll probably post a summary on the model s front page, where it's more likely to be seen.
In short, though, I was able to prearrange charging in a neighbor's garage with 30 amp dryer circuit.
My brother went to the neighbor's garage/laundry room and took a photo of the plug, and I went to Home Depot and bought materials to make an adapter. $23 and about 15 minutes later I was good to go. After making the adapter I tested it on my own dryer circuit. 18 miles/hr charge, with no excessive heat.
The 161 road miles (with a small detour) consumed just over 170 rated miles at an average 55-60 mph with a brisk crosswind and mild (80ish) temps.
5 hours of charging from a gracious neighbor while we went boating and ate and I had 196 rated miles when we left to come home. Averaged about 60-65 with less traffic, less wind, and cooler temps. Arrived home with 34 rated miles. All of the driving was on dry roads, most of it rural two-lane, some of it winding with frequent 25mph turns and switchbacks.
There were several RV parks and boat storage facilities, but none that were convenient to my destination. I talked to the Red Apple Inn and country club, which is a five minute walk from my brother's house, about getting a destination charger from Tesla. They seemed receptive, but if anybody else might be interested in a destination HPWC at the
Red Apple Inn please reply to this post or PM me so I can use it to bolster my case.
Www.Redappleinn.com.
Thanks for the advice and suggestions.