RC is cheap for good reason. Like mentioned above, the R&D of their products is seriously lacking. I had the RC 3" kit at one time and that was complete and total trash. Holes didn't line up, the ball joints were junk, etc. RC also thought it a good idea to drill out your spindles. My front end guy nearly went blind when I told him I drilled out my spindles. I am one of MANY who had major issues with BJ failure and alignment problems. RC was made well aware of the issues by us, the consumer, and they chose not to do anything about it and actually acted like there weren't any issues. But here we are in 2011 and now RC says, "The kit has been redesigned and we don't have anymore of those problems." So now they acknowledge that their kit sucked, but it only took them about 3-4 years? Seriously????
RC's 5" kit seems to be the only properly designed kit that they make, so it seems decent enough. But the 7.5" creation is laughable. Instead of desinging a larger kit, they decided to stretch out their 5" version. So you add larger strut spacers and 6.5" BLOCKS! So now you have a 7.5" of total lift with spindles that are only just large enough for the 5" version to go along with a 4-5" diff drop. Basically your CV angles are bad and will probably bind off road, and the upper ball joints are at even worse angles. They are so steep in fact that RC requires you to cut off the droop stops so the UCA's won't ride on them. Droop stops are there to limit down travel, so it's not a good idea to remove them. Throw in some junk shocks with maxed front end angles and rear blocks that are waaay to tall and you have truck that rides like a wagon.
Rockstar, I know you have the 7.5" and this isn't a personal attack against you or your truck. I don't know everything about lifts, but I do know that I don't like what RC did with the 7.5" kit.