If u are fixing it for yourself then that is not flipping it. This is just fixing it up for yourself. If you are new and wanting to flip RVs and know nothing then, no, this is not advisable.
Answer is it depends. It depends how much the RV needs and how many hours you will spend, and how many you have to give. A distressed, damaged, water damaged RV can take many many weeks going full-bore. At some point you feel it is too much, and after it is done all you see is the wasted hours fixing it, and it is hard to enjoy the finished product. There is a balance between the satisfaction of fixing it up some, and having to do so much that it ate you.
I have done 6. Some I was so sick of I just sold bc I could'nt enjoy it, it was so much work, so much effort. Others were easier and I did some work and was able to finish reasonably and could enjoy it.
Honestly, the one I am in now, I just do not finish it (finish work like interior painting and making it appear nice inside). When it is not perfect, then I do not have to be so careful so I dont damage any pretty thing I spent time fixing.
The last one I thought I would keep forever, it was so nice, but required a big truck which I got rid of and that changed everything.
so glad to not be in a diesel currently.
If you are just talking about cosmetic changes and are going to ignore the water damage, and other issues then go for it. You need to address the physical needs of the camper first, then make it pretty last.
Almost all used campers have some amount of water damage if older than 4 or 5 years or unless garaged and taken well care of.