I am helping a neighbor, who has a new garage that needs an Electrical panel installed. He has a Mobile Home pedestal that only has a space for a 2 pole breaker. This would be great for the Garage feed, but he also would like a 50 amp RV Plug near the Pedestal which is approx 100 feet from the Garage. This means that We would need to install a sub panel near the Pedestal and then feed the RV Plug and the Garage panel. It was my intent to use a 100 amp 2 pole breaker at the pedestal and run a 4 wire to the sub panel and back feed another 100 amp breaker at the sub panel with a hold down bracket on that breaker. Isolate the ground and neutrals. Then I could install the 50 amp in the sub panel for the RV and another 100 amp breaker for the garage. Then run another 4 wires to the garage and backfeed another 100 amp breaker in the garage. Isolate the ground and neutral again. Of course, everything would be run in PVC Conduit. My questions are... #1. Other than weather tight, is there any special type of panel I should use? Any special things I should consider?
#2. I know it seems like a lot of 100 amp breakers. 4 total in the circuit Is that legal? Maybe I should feed the sub panel with 125 amps and then the garage with 100 amps. What is your suggestion??

How many amp service is the main breaker box going into everything? If its below the total needed to run everything at once then it will need to be upgraded first. Otherwise there are hazzards and brownouts that can occur. That would wreck havoc on everything.

The main pedestal is a 200 amp service to a single wide older mobile home. The garage, which is just used for normal garage use and not for a welder etc. is actually an over kill at 100 amps. There really would never be a time when it would use more than 50 amps but I felt it was better to go more, just in case.

So if your splitting 50/50 between the garage and the RV outlet then you should be fine. What you always have to remember is that any work you do may go beyond anyone your doing it for. So if the home is ever sold or transfers then at least you are being safe.

Thank You