Agree with 3rd poster. My 2012 has a different brand of convection oven and it irks me because preheating it takes forever and overheats the whole trailer. BUT if I just want to heat a cup of water for tea, etc. I like the microwave.
My first solution is a portable electric oven. There are dozens to choose from - anywhere from $150 up about as high as you want to go. Set on a rolling rack outside it works fine for baking and so forth. A bit ungainly to transport, so best for snowbirding.
If you camp without hookups, consider cast iron cookware (buy in a thrift store or hardware store or pay too much.) There is a great thread here for Dutch oven cooking... start with one 12"inch Dutch with the rimmed lid (and IMHO add a "pot lifter" for safety). Alternately a few campers choose a "camp oven" which uses propane and seems best for feeding the multitudes - shines at rallies. Camp ovens can be found at camping supply stores or online. I have no personal experience with these.
Today is a gift, that's why they call it the present.