Clare44man,
.30-.30 is definitely the most common model 219 that Savage produced. They are always for sale on GunBroker, so if you go there you'll be able to find the most potential buyers, and see what they go for. Cutting the barrel on a rifle is usually a recipe for changing the point of aim...but if yours shoots straight and you state so in your listing I imagine someone would jump for the right price. But it won't be much.
Maybe $100.
BTW, it's a fine gun for an RV if you live in one of "The Free States," so given it isn't worth much you are far better off just keeping it...however little or infrequently you use it. Broken down (and with a 20" barrel) the darn thing fits just about anywhere. Plus single shots aren't going to raise the hackles of any law enforcement the way "scary" black guns do.
I live in a "Progressive Utopia/Orwellian Control State," so any firearm in an RV has the potential to get you into serious trouble.
-Sentry44