Time constraints - This is also very important. What if you need the work to be done for a couple of weeks and the dealer take a month for the same job? Ensure that the period of time. "To discuss and decide" is the guide here.
The cost of the kit alone is about half the total installed cost. It makes sense to either get a dealer to do the foundation work and tie-in with the house electrical system, or hire separate mechanical and electrical contractors.
I'll take a quick look at Google here and let's go check out a site. Here's a client of mine CJH Electric. It's a WordPress site. It's a nice looking site. It's got tons of content in it. This guy is in Southern Maine. All over Southern Maine he comes up on the first page of Google and usually at the top.
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NOTE: Be extremely careful with the home wiring hookup step of your project. If you're the least bit unfamiliar with your electrical system, get professional help as a mistake could cause severe injury or death.
Solar Panels use photons from the sun to generate electricity through the photovoltaic effect. Most modules use water-based crystalline silicon cells or a thin-film cell (based on cadmium telluride or silicon). The cells are then connected electrically to one another and to the rest of system, being protected from mechanical damage and protected from moisture.
Wiring is the major thing to examine before purchasing an used trailer. Trailers built in the 70's or before could have serious wiring issues. That's because laws were more lax then and electricians got away with installing aluminum wiring which was stretched tightly to cut costs. After a period of time, let alone moving the trailer, these wires can snap or crack making them a serious fire hazard. Have an electrician check the wiring in a mobile home you're considering - it'll be worth the price he charges.