I'm putting in a 30 amp breaker box for my 5th wheel at my lease. The box I bought has a 30 amp rv plug and a regular 20amp plug. The box is going to be around 85 ft from the electric pole where the main breaker box is. I'm planning to bury the wire in grey conduit. I know code says I need to bury it 18 or 24 in. but this is way out in the country so do I really have to go that deep? Also, can I use 8 wire or do I have to use 6. And do I need two hot wires or just one. And for the breaker in the main box do I put a 30 amp or 50 amp breaker. And last, do I have to put a grounding rod in for the new box. Sorry for so many questions but Thanks for any help you can give me.