Yes! We ordered our camper without the microwave and use that space for one of these. We also ordered without an oven which gives us tremendous storage for pots, plates and such.
Toaster ovenWe love it. It is large enough to bake in. Bread, casseroles, pizza, broil steaks etc just like a gas oven. No turkeys on Thanksgiving though ;)
One thing to keep in mind is that these get pretty hot on the outside. The space we use doesn't have the clearances that the manufacturer instructs. I installed small computer type 12v fans in the back of the cabinet that moves air over the unit to keep the camper walls cool. We have used it extensively now and no issues.