Ok first off excellent job on your electrical work and fan placement. The lights your useing with that many should do you just fine...by the size of that fan filter I take it this is a covert grow so I suggest makeing an 8” hole dead center of the back of that trailer and hook up duck work to vent air out of the top that way the stink gets sucked in from the back of the trailer threw that 8” hole and is throw out of the top of the trailer creating negative pressure....negative pressure insurers that absolutly no stink leaks out unless it’s gone threw that filter first....a covert growers best friend is negative pressure.... also I worry about humidity and heat....iv worked inside of trailers in the past and they get fucking balls hot the vent idea I pitched to you should help with this..... humidity will be make or break for you with this grow my friend...that’s a lot of plants in a small space like that remember they will give off 1gal of water each into the air when their bigger u need to keep that shit in check or you’ll get bud rot and have to toss everything.......for future reference next go around rent a backhoe or excavater and put that big beautful bitch in the ground