Without effecting ride quality? Simple, you can't. No matter what kind of spring you put on, it's still lower, will scrape easier and more prone to bottom out with added dunnage on the back. Even an adjustable air kit, isn't the same ride as stock, but it's better than having a static drop. That being said, a pcs kit and a heavier spring isn't a bad way to go. But it's still not as good as stock.
Have to agree with the Guru's. Mine is stock with a 1100lbs spring for two up and trailer at times, and I have had no issues scraping at this time, however, I have only had the new spring about 2 months.
Not much if anything at all, it just makes it stiffer, unless you have the progressive then it will do nothing untill you load it up. If you do a lot of two up, try the 1100 or 1200lbs instead of the 1k.
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