Portable aircon in small caravan?

Heya Folks
Just wondering if anyone has used a small portable room aircon in a caravan? I have an Arlec PA-9000 which has been used in a big room with poor insulation at home and, while not perfect, runs remarkably well. In a smaller insulated area like the van, should work much better
I see no reason why it wouldn't work in the van. Sure, it's bulky, and needs to be put somewhere, and needs an external duct (which is simple enough), needs draining, and a whole lot of other negatives... However, it's also cheap, and when you don't need it, you don't take it. It should also run on a much smaller generator than the min 2000W Honda, or 2500W everything else, that most van aircons seem to need.
I don't need info on caravan air con units...got plenty of that, both positive and negative. Just wondered if anyone uses the portables, thanks.
Cheers,
Scott