Contact a mobile home (or modular home) installer in your area and ask them for their complete pricing. It might be cheaper in the long run, and done by people who know exactly what needs to be done.
It would be very hard to estimate what it would cost, based on not knowing the type of soil you live on, the assess to gravel, etc. Also, don't forget about the electrical wiring, the water supply, and the sewer or septic connections.
Last edited by havasu; 02-06-2011 at 10:58 PM.