No shuttle directly from the RV park, but there are several travel companies very nearby (for a fee). The free shuttle starts inside the park.

Not when we were there, but it was not a far walk to where there is a shuttle to the Grand Canyon.

i cant say for sure as Covid was changing everything. the showers were even closed! i did take the shuttle along the rim, but i seem to remember there were limits on amount of guests on them. and masks were worn