a few ?'s regarding the rear bumper/tire carrier you are working on:

1. will it be sold as a modules:
i.e. a. bumper with or without tire carrier?
b. will without be upgradable?

2. will it be out before ECXC (www.ecxc.com)
if so, could you guy cart one up 4 me
(beers on me)

3. Pictures?

(if any of these have been asked before Flame on)

Side note.. I love the sliders, I have broken rocks with them. the quality of tthe welds is impresive. (remember Tread lightly)
Also it is great that you are seeking user input during your design and fab phase, very Six Sigma of you. (engineering joke)