Keep looking around at coaches. Not all have the oven removed. If you are buying new or nearly new, usually salesmen will do ANYTHING to get that rig out the exit including installing a full stove and oven for you too. So if you like everything about the coach, but the lack of oven, dump the idea on the salesman.
Mine came with a oven and 3 burner stove top. It's a Magic Chef and I use it with a thermometer inside. It cooks perfectly right on temp, once it's preheated. Some things don't need the preheat, others do. I don't know why they don't include the oven thermometer, but I find mine valuable to let me know when it it preheated. The oven is kind of small, so measure it carefully before buying pans and roasts.
My sailboat had an RV oven that was superior to the one I have now, I could fit a turkey in it. My current Magic Chef left a huge broiler at the bottom, they could have made it much smaller so the oven section would have been higher and held a turkey. But I discovered the boneless turkey roasts by Butterball and others. This does superbly well in a crockpot, especially on low all day. YUMMMY.
I've also enjoyed the crockpot so much, I have 2 in different sizes. I have experimented baking in them with great results. Baked potatoes in a crockpot are superior to those in an oven or microwave. Yes, it takes longer, but the advantage is, I often have the crockpot going while I am driving down the road.
For safety sakes, I put my crockpot in the sink on a rubber shelf liner and one comes with a special rubber band for the lid and the other one I use a bungee cord on. That way if I am forced into a sudden stop, hopefully I won't be killed by a flying roast...
One of the joys of fulltiming in an RV is being able to cook at home all the time. It's a huge money saver (leaves more for the fuel tank!) and you know exactly what you are eating. So many franchise type restaurants now pour loads of chemicals and high fat sugar type ingredients into the food. They don't have to disclose all this on the menu, so it's frustrating. Much of the food is made hundreds if not thousands of miles away then "finished" at the restaurant.
Also, I like to camp in beautiful places and those tend to be remote, so cooking is preferred unless one likes hours spent in a car on roads hunting down restaurants (I prefer nature!)
I do use my oven often in the winter, not so much in the summer. I wish my antique microwave had the convection option. I just haven't had the funding to switch it out. It works perfectly at 19 years old as a plain old fast microwave, which I do love steaming my veggies in there. Yum!
I store my pots and pans nesting style inside the oven with little cut sheets of rubber shelf liner between them so they are quiet when I drive. When I want to bake, I put them all in the bed or shower or counter (if room) so I can use the oven.
I never found a nesting set I liked, so I built my own by buying one of each thing I needed and wanted that would nest the way I wanted and all fit in the oven, so my oven does multi-duty, it bakes, broils, toasts and stores.
At one point someone gave me a convection oven, so I used it outside on the patio, other times covered it with a garbage bag between uses to keep the rain out. But I had to always stow it for travel and one day I gave it to someone in severe need. So no more patio oven for summer baking.
One distinct advantage to buying used RV over new RV, is that you can take all that extra money to customize the coach to your lifestyle. In the past 3 years, I have slowly done this and that to my little old RV, especially the kitchen area. Like I added built-in spice racks, condiment units and so on. I have a tiny little galley, but I can pop out a gourmet meal for a crowd or just me. Much of my social life is spent over a dining table, either inside the rig or the folding one I travel with.
Ideally, I would love to have both a propane oven and a convection microwave combo.
If I were an RV designer, I would install a pass-through fridge and freezer that you could access inside or outside. I also have crazy ideas for a kitchen that would swing outside at will, so you could enjoy the great outdoors while cooking.