Any electrician can do it it's easy stuff in theory, the issue is how far away your panel is etc etc

People here are recommending the equivalent of s 30 amp dryer plug, which is certainly easy but it might not provide enough of the charge for your needs.

First calculate the charge needed then add a margin and work back from there.

I'm leery of everything that isn't hardwired because it just sounds like a hack homeowner thing but that might not be entirely fair.