simple cart out lumber (2"x4"s and 6"s). It has wheels
I think this is going to to be the route I'm going to go. Make myself an "off-road" dolly.I made a dolly for mine from directions off the internet. Top stands vertically and is easy to move around. When it’s going to be stored for awhile I use a cover that contours nicely and then put a tarp over tied down with bungee cords. The primary cover protects the underside better than just the tarp. If you decide to build a dolly use bigger wheels with locks.
FYI: I used these instructions for my dolly. I’m sure you could bolt some bigger wheels on it.