Instead of a portable unit like that you might want to look at a mini split system. The compressor goes outside and the cooling element inside, so there is no exhaust from the room, eliminating your exhaust odor problem. A bit more money than a portable but might be worth a look.
Thanks Muddy. I hate to spend a shit ton of money on all this... my central air does fine 10 months out of the year. I think I'm going with a portable unit and I'm going to buy an 8" inline fan with a fat ass carbon filter and just set it up in the room where my tent/AC unit is and just scrub the air. Carbon filter in the tent + carbon filter scrubbing the room = Hopefully less smell.
I'm still spending over $500 bones for all this shit. Kramer (Seinfeld) said it best, "retail is for suckers". I hate being a sucker.