Reno 550.32 requres a ground electrode at each "disconnecting means" in sight and within 30 ft of the mobile home. (the pedestal). When I was with the state we did a lot of these. You are right about the power. Assume the worst about the load. The end up with huge HVAC loads in the south since these homes have little insulation and the sun load is worse than a house. (no attic)
We ended up replacing the standard 50a pedestals with 100a services if it was anything larger than an old single wide.
