If you enjoy baking while on the road, then a toaster oven is definitely a good addition to your RV. Toaster ovens are more energy-efficient than regular ovens, so they'll save you money on your electric bill. Plus, they're small and compact, so they won't take up a lot of space in your rig.
One thing to keep in mind, however, is that toaster ovens can get pretty hot. So if you're using one in your RV, be sure to keep it away from any flammable materials. Also, make sure it's properly ventilated so the heat doesn't build up and cause any problems.