VERY nice tricycle! I know exactly what you mean about sight-seeing in national parks in the "OPEN".
We never did the "motorcycle" route, rather the "2-seat convertible" route. We towed a 2000 MR2 Spyder m/t for two years. What a joy to sight-see with the top down. It was a very easy tow vehicle. We had to give it up because we found ourselves taking it on 4x4 trails through dry river washes and such to get to trail heads. During our second trip, we made the decision to replace it with a 4x4. The defining moment was when we parked with nothing but Jeep Wranglers at a trail head....the looks we got were priceless. Here was our MR2 in tow.
We own a 2007 Saturn Sky m/t today. The gears in my head are turning thinking just maybe.....take it on trips where we won't be doing off-roading. Blue-Ox makes a setup for it's sister the Pontiac Solstice. It would be an experiment to say the least.