The problem you'll have is the amount of R&D expense vs the 'profit' of the sale on it. I know the Tracker and the Vitara are duplicates in the design, but still how many owners of these are willing to change the suspension?
I know that there are other manu's, ie Jeep, which develop a vehicle, and before it's actually available for the public, some aftermarket company has developed something for it. It's all about numbers.
Take it upon yourself to get one design and built for your vehicle and you'll see all about those numbers.
As for lifting enough for 6", I wonder what size tire you are going to run? Those wheelwells only handle the 225/70-16 just fine, anything bigger, you'll need more space at the bottom of the wheelwells. You'll be modifying the overall looks of the -7 with trimming of the flares, then relocating the floor some so that you can turn with large tires, etc.
However, don't forget, there is no support in the driveline also. No gear ratios other than factory (5.13, 4.30), and no lockers, manual or automatic. Then there is the no-joint rear ds issue.
As for what others are doing to their -7's, take a look at
http://community.webshots.com/album/124974744wYftjp. These pics came from a site for Norway, Iceland, something like that, months ago. I don't have that link, sorry.
If you are interested in the design of such a lift, Mikerpm4x4 (on the Ultimate Adventure trailride) is one that has done this on a Tracker (search for Tracker on 37's and article archive for more info), there is some guy in NC here with a Sidekick 4dr (can't remember id) which has done this and he's still working out the steering issues, there was a manu'r (Pro-Comp-no longer for sale) whose lift included lower control arm drop brackets (and these come up for sale here or Ebay about every blue moon), and probably more.
About what you can do today is the Calmini, coil spacers, or go custom. Nobody has done a rack and pinion swap to a steering box so that would be a good start. Then either go custom IFS or straight axle. Again, it'll depend on tire size. Don't forget that larger tires reduce the performance of your truck. Gear swaps brings it back. So if you have a manual trans (comes with the 4.3 rear diff gears), you could swap in the 5.13's from an auto.
I'm still having trouble getting the front coils to collapse for the spacer. I've tried for the 3rd time now and I'm getting pissed at it. Now I'm calling about the adjustable coil spacers for Jeeps, Hondas, etc. Hopefully the specs will work with the bounce stop design of the -7.
