Well, we got it home. Thanks to all for your input and recommendations.
Trip was about 125 miles, I loaded and towed conventionally, facing forward. The truck didn't fit well, it was tight left to right, but more importantly, the strapping was very marginal. The truck tires are large 16" tires, the straps were for a smaller wheel. I tightened them " gorilla tight", adjusted and checked them 5 times in the 125 miles, and drove 55 mph.
Now, return the tow dolly, and get back to towing all 4 down. Sure like that better.
Thanks again for your comments. Good group on this forum,
2007 Newmar KSDP. 3912
2010 Nissan Frontier SE