I am running a Tanaka 32cc. I ran it 120 miles in a day with a short break for lunch. There is no question that the endurance of this engine exceeds my own endurance by a huge margin.
yep i run mine till the tanks empty or im too buggered to go on
at times. im guessing its better to run them with a load instead of a long period of idling
Grab yourself a trailer like the one in my pics in my intro post. Just put some wheelbarrow wheels on it if you want to go on bad roads ;-) If you will have over 200 lbs of gear and gas in it, then it will be challenging to get it rolling on sand roads, as it was for me =-) But the two stroke 66c motor will pull it easily to top speed even with all stock parts. I got a 35 tooth sprocket though.