I use a roll-around portable 8k BTU a/c in our 16' box trailer, works ok. All I had to do was cut a small hole in the floor for the exhaust hose.
KCBS CBJ #22109
Mid Atlantic BBQ Association
FEC100 Righthanded, FEC100 Lefthanded
Meadow Creek PR72 Pig cooker
wsm & Weber kettle