Flipping the lunette is a great idea, if it's not rusted inplace.. Mine was. I loosened the nut, beat on it ith a sledge hammer, still didnt move after 15 minutes.. I put the nut back on, and rolled like that, with no problems.
Also, BRING A GOOD JACK WITH YOU. Chances are VERY GOOD that your hitch wont be at the same height as the landing leg when it is completely compresed (if it's the later dual wheel style). A floor jack with some 4x4's or the like will make lowering the trailer onto the hitch a breeze.. If you think you can heft it on by yourself, your going to be disappointed.. It wont happen, I dont care how strong you think you may be.... The jack is the way to go.. Or, give the DRMO guy who is rolling thru the pickup yard with a forklift $20 to help you out lower it on as you pull the landing leg release..... Dont ask me how I know....
Here is a pic of my recovery with a Dodge 1500. The truck is level... The M105A2 angled down, but pulled great for the 5 hour trip.
Also, if you have a spare tire/rim for the M105, bring it.. That will guarantee you wont get a flat.