Wow, Thumper is one big bunny! I'm so glad to see he's recovered from his broken leg. My sister has had two pet rabbits over the past 20 years, and they both lived to be quite old. Your rabbit sounds like and looks like he has quite a personality! And he seems to have a great place to live on your porch.
I know what you mean, it is harder these days to find a vet who will see small pets like rabbits, hamsters or birds. Most just treat dogs and cats, or else farm animals. So now I have three veterinarians, one for my cat and dogs, another for our pony, and a 3rd one for my small pets who thankfully don't need medical care often.