You need to make sure you can pull about 60 amps total in the trailer, 50 will be used for growing, and you need the thick gauge wire so your way under the load, so yeah you need an electrician, then you need an hvac guy to make sure its all sealled and get AC going and smell control with good ventilation, then your going to need to section off 4 areas, 2 flower areas and veg area, 1 digital 1,000W HPS light in each section, you will need to test your water and make sure its good but you should probably just get a large RO filter that can do a lot of gallons because tap water often sucks for growing, then get about 12 plants under each light, 3 of them a week older then the other 3 and so on so your harvesting about 3 per week, then get about 3 more medical marijuana cards and there ya go your using your whole trailer capacity and growing a constant supply for about 8 people or a little more but your electrical bill is going to be a shit ton. Unlimited weed for you and 10 friends about 10 grand to start not counting the trailer. Hthere ya go have at it.
