I eventually want to get a bike trailer and with summer coming I'm thinking more about it. I'd like to get something about 14' long with a side door and A/C. My question is, how powerful are the A/C units that go in trailers? Also how expensive are they? I'm concerned that on a 90+ degree day that it may not make a significant difference with the back door open (maybe I could add one of those shredded plastic curtains?). Any suggestions welcome. Thanks!