Now that we have a travel trailer we don't have those handy 12V plugs to plug in bunk end fans. Those things were decent, low amp fans but even better white noise while boondocking. Got any recommendation for a USB powered fan that is fairly loud? Doesn't have to be as loud as a C-5 jet but loudish would be nice and while we're at it fan capabilities would also be nice. At home we sleep with the Dohm white noise machines. I've tried searching on Amazon and here and can't find comments on how loud a fan is... Thanks! PS: A fan is preferable because the electronic noise generators usually have a repetitive loop I can hear that distracts me from falling asleep. Yeah, I'm that picky.