Haha, I am literally reading through the 40 page Bilstein 5100 thread as I got your notification. I am still on the fence. I really like the look the Readylift 3.5" gives. I had done most of my research thinking we had an ORP truck so I planned to "make" a lift similar to the ready lift kit. My old plan was to use a 2 or 2.5" top-hat (on top of the 1" stock lift) and then use a 1 or 1.5" rear spacer. I purchased the Rough Country "scratch and dent" UCAs for $110 bucks. I figured for the price they are better than the Mopar UCAs because they are designed for 3+" of lift not just a balljoint with higher degree of motion.
Now, I'm not sure what to do. after reading the Bilstein thread alot of people said that route is better than a top hat. However, I don't want to buy the Bilstein 5100s and run them on the highest setting as that makes a lot of preload on the spring. My thought now is to possibly is to use a 1.5" or 2" top-hat and the Bilsteins on setting #4 or# 5 and then it splits the difference between preload and a strut spacer, just like the readylift does, but i'll get the benefit of a much better shock. and i'll get around 3-3.5" of lift. Then of course a 1 or 1.5" rear spacer.
Are you just trying to get 2" of lift? what has made you decide against a 2" Top-hat?
One thing to note- I pulled the buildsheet up using-
https://www.dodge.com/webselfservice/BuildSheetServlet?vin= and my build sheet includes a line item saying "Raised Ride Height" but I am sure the springs on my truck are not the ORP springs. I think I'm going to go the dealer to measure some other trucks and look at their part numbers. Have you crawled under your truck to see if its the same? ORP (extra heavy duty shocks) and standard springs?
I hope this helps, and I'm open to any advice you have as finding out my BTS didn't have the ORP shocks was a curveball.