I can comment...Cons of strut-top spacer:
Some people complain about body roll when cornering. ADF (anderson design fab) says that it's unnoticeable at 2" of lift, that's his opinion. I don't have a lift (yet) so i cant comment on it.
This has been my experience with just a 1" lift plus new KYB's and King standard height overload springs in the rear. From totally shot OEM struts to these is a huge improvement. I also replaced RSB bushings with @traildogck 75d bushings and put new endlinks on, which I'm sure helped with any roll there may have been if I had left those alone. I can't speak for having a lot of weight in the back yet, but empty there's basically no noticeable roll at all. I had thought about upgrading the RSB to a 16mm one from a LGT but I do not think that's necessary now that I have everything installed....And if any body roll was there, the new struts & springs have completely eliminated it. I'm liking Wanderlust's ride quality so much now that I'm saving up the necessary cheese to replace the front springs & struts with KYB & RalliTEK components.
Just my $0.02. As always, YMMV...