I rigged up a marine tank as my extended run tank. I have a nice long chain lock I use and lock it to the rear bumper of my camper when in use. Of course, I point the exhaust away from the camper!
I have found that mine needs to be close to level to run in cold weather, so I have a little wooden platform I set it on. I have another piece of wood I can use (tucked between the top of the bumper and the bottom of the trailer) to shelter it from rain or snow.
I use ethanol free gas now that I paid to have the carb cleaned. That's the only maintenance I have done except changing the oil and replacing the spark plug in the 7 years I have owned mine.
When I pack it up for the season (I only use mine in the winter), I run all of the gas out, drain the remaining gas from the carb (there is a screw for doing this), and then put a little Sea Foam in it, start it and let it go until it cuts off.