There is a product called an "ATV Arch" and also a "Jr Arch" used to move logs by atv and by hand. You can see both in action at Future Forestry Products web page. It is www.futureforestryprod.com These are a scaled down version of what the old timers called a log arch. The small one looks nice and is reasonably prices the "atv arch" cost more but will haul more. Just remember you can sell them after your done with this project if you don't need them anymore. Or you can have your welder make one for you.
Good luck on your project. Jim