Far as I remember, the only thing the crew did on RK was run them to get gas and parts and only when necessary. And with the advent of Uber and Lyft, seems like you could get the same support with a cost.
I guess the crew has sometimes helped push a vehicle or give a jump, but I bet someone without a film crew could probably get random people to help in the same way.
And I find it funny that everyone assumes that they got so much from sponsors. My gut says if that was the case, they wouldn't have been cancelled since the show would only have to fund salaries and would probably be making money. Didn't seem to me like they were getting sponsor support for parts.