I had Vintage Air in my '70 and took it out after being frustrated at it every winter. The fan was louder than factory stuff and way less heat. It was recirculate ONLY so the windows were always fogging over. I had ice on the inside when temps were below 25 out. The cooling was fine, but same fan irritation. I didn't like some of the component fitment when I got it, so I worked on that. But it did hold a charge for all of the 10 years I put up with it. No matter what, I am very glad to be rid of it!!!!!!!!!
After owning that system for that much time, I rehashed every possibilty to make it suit me better, but why when factory stuff can work better. It was not easy to make the hose connections inside the cab, then I was nervous about tweaking a line, not much airflow change for fan speeds, I had to adjust the thermostat for the compressor for summer and winter, it couldn't even keep the windows from fogging in a summer night rain storm!!
I know the humidity in Nebraska is higher than where I am now, I used to live by South Sioux City, so I think that may be concern. Like I said, the A/C worked fine, but if you use your truck year around and get it in low temps... When was the last time a hotrod was out in such conditions???
Sorry for the long response/rant, but...