I am about to under go the same thing just a different route.
I just purchased a Hawking HI-Gain outdoor wireless repeater. Here is a link.
My plan is to mount it on the back of the AC housing or flat on top and run the power cable down the reffer vent. It is weather proof and very high powered (will give you a little tingle if you touch both antennas). This will allow me signal with out having my computer hooked to a cable.
I just installed one of these at work and i have full signal over 1000ft away and the unit that it connects to is 200ft further away than that.
While installing this I barrowed it for the weekend camping trip. I plugged it in the outlet in the reffer hatch and had perfect signal. ( I had no signal even outside before.) This unit will act as a repeater, bridge, or and Access point.
I do not work for or sell these units. (I work for a college that uses them now)
You can pick one up for around $250 - $300.