I always use the standard 87 fuel in everything - no premium needed. Used it in our last MH that had an Onan 4000 in it and use it in our golf cart without any problems. The Stabil is important depending on how quickly you'll deplete the tank, but more important is making sure to start and run it at least once a month to get the standing fuel out of the bowl. The ethanol in the gas will start to build up a residue (looks sort of like white salt crusted on everything) quickly, especially in hot humid weather. I stupidly forgot to start our generator once for about 4 months and wound up having to replace the $300 carb due to the ethanol.
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!