The springs I got are the Bad Swede kit. Unfortunately I'm in the process of buying and soon to be remodeling the house I live in so my garage time has been too limited to get them installed. The car is full stock right now and I've taken a few good solo trips in it thus far but my GF and I have 3 dogs between us so recent trips have been in my AWD Astro for space and carefree abuse (of the vehicle, that is). The Volvo is still my "nice" car for now and Yes, I love the seats.
Based on my experience in the Astro with nothing but a 2" lift, good shocks and A/T tires (Cooper Discoverer AT3)...the tires are the most important bit. My van is frequently overloaded but with slow careful driving it handles tough some tough UT roads. This last weekend I had it to the top Wildhorse Canyon in ID, moderately rough road. On the way down I actually caught up to a Sportsmobile and Vanagon Syncro Westy and I wasn't pushing those tires at all. I'll be putting the same Discoverers or BFG ATs on the XC when the tires on it wear out. It currently wears Pirelli Scopions which are actually pretty beefy for their size but have a very road oriented tread. Not a bad option for a tire but pricey.
Most of the rough roads I did in my Passat were on Nokian WRG2s, a great year round tire for the PNW (was living in OR for 4 years). For a stock size tire it was extremely durable. If you ever replace the air system on the all road, I think many do. Consider Bilstein HD shocks. Pricey, but that is what I use in the Passat. Make road driving even better and handle big loads well. I currently have one rear needing warranty replacement (leaking) but I've put over 100k very demanding miles on them and prior to the one leak they drove good as new.