I did some research a while back in case I wanted to do this with my new truck...still waiting for my 5th Gen arrival, but that’s another story...anyways, Thuren is an option. However, they aren’t much cheaper than Carli. Save your money and do it right. It’s gunna cost you about a thousand bucks or slightly more. You could always buy a cheap spacer 1.5 to 2 inch, probably for under 200 bucks. However, the guys at CJC Off-Road have options available for 3500’s with auto leveling suspension. They are mostly 1.75” kits. They come with soft ride front springs and Fox shocks tuned to match. Don’t forget, you NEED a front track bar to ensure your front end is where it needs to be. Also get it aligned too. No matter how you look at it, it’s gunna cost WAY less than a Chevy or Ford lift. Just say’n. I did the cheap route on my 3rd Gen Ram and eventually added an adjustable track bar. I wish I would have bit the bullet and did it right from the start, so I will do the new truck right once I am ready. Good Luck.