I know you have been waiting for a CNG pickup. That still might be a ways off. There is still a problem with CNG availability. I looked at getting a dedicate CNG van from MI to Kansas City. If I can get it to St. Louis, I can fill up there, and make it to KC. However, with a 300 mile range, it will be cutting it too close for comfort trying to get to St. Louis. The other problem is many of the stations are not readily open to the public. With some of them, you have to call ahead to make a reservation to get fuel. Unless companies are willing to make a significant investment in infrastructure, CNG is going to have a tough time gaining popularity. Traveling across country right now requires a lot of advanced planning, and fuel may not be available in a lot of places. In addition, currently the upfit for a CNG system is about $11k - $14k (at least on cargo vans). Now that the Fed tax credit has expired, that’s a hard pill to swallow. One more obstacle will be the number of tanks needed, and tank placement. If you want a 300 mile range with CNG, it’s probably going to take 4 tanks, and at least one will probably have to be mounted in the bed of the truck, taking up usable space.
The only viable option would be a bi-fuel system that would allow you to run on CNG and gasoline. There are some systems out there, but they are pretty expensive too. Then, there are the warranty issues caused by having a 3rd party install an aftermarket system. It’s never easy is it?