If you're a legal OP then I would ditch the trailer idea and build a greenhouse. The steel trailer is not the easiest place to grow. A Greenhouse will allow way more environment control and save a ton on the power costs. If you have no grow experiences than I would go with something simpler than NFT, till you have a few strains and experience under your hat.
If you are set on NFT, you better read more as your equipment list is way to short.

Best of luck keep us posted on your progress.

Friend of Greenhouse
North Coast Growers - Friends of Green House - New Audio - YouTube