I had a MaxxFan Deluxe (remote) installed on my first trailer after delivery.
I am having the same installed on my new trailer prior to delivery. I love that fan - the remote is wonderful - get too cool or hot at night, just have the remote close at hand.
Ten speeds, low amp draw, pretty quite on the low settings (my first MaxxFan only had 4 speed settings; new ones have 10)
Works in the rain and you can even travel with it open, although with a travel trailer, I don't know why I would...
Pricey, but well worth it for me (I'm short and that remote sure comes in handy...)
