I will just back up a bit. Explain that with this type of setup has to many legal implications to do this way. Maybe the route to follow would be do dish installs on each trailer and either renting the FTA boxes to tenants or outright selling them the receivers.
On initial quick assessment of expenses involved there really would not be much difference. Would be 24 receivers as opposed to initially 10 and same for dishes but no amps or
modulators or combiners and one would think considerably less coax to run
He could also start out by only doing a section at a time. 6 trailers in row A and so on.