As far as adapters not being safe... I wouldn't run them if they weren't safe. Are there unsafe adapters out there? yes, I'm sure there are. I purchased my adapters from TONYP on this site. I believe I got his second to last set, as he was just doing it on the side, and he didn't have the time for it anymore. Anyways, his are made of aircraft grade aluminum (Strong). And when I installed them I used ALOT of loctite and ALOT of torque. They have been on there for about 9 months now with over 20,000 miles...no problems.
The reason I went with the adapters...
I had just picked up my 14 bolt (was in the cargo area of my blazer) and I was merging onto the highway on the trip home from picking it up, and BOOM, my 10 bolt blew up. I had it towed to a local 4x4 shop, and I needed it back on the road ASAP as I was scheduled to drive across the country that same week. So my options were:
1) Buy some 8 lug rims for the rear, and mount the tires on and go. This is the cheapest method to get on the road quick but definitely not the way to go. You would have to carry two spare tires, and to rotate tires you would have to dismount / mount them on the diffrent rims...not worth the hassle.
2) Do an 8-lug conversion. This is a good choice, because you get a slightly beefier front axle, and you only have to carry one spare. But to do this swap economically you should gather parts over time when you find a good deal on them. I didn't have any time, so I would of had to either buy crappy junk yard wheels (I had no transoprtation at the time mind you) or buy 4 brand new 8 lug wheels, and brand new 8 lug stuff for the fron axle - and that was an expensive proposition.
3) Buy 8-6 lug adapters. I could use my existing wheels, did not have to touch the front axle, and could be done quickly. Obviously this is the route I went...And I am very happy with the results.
As far as "The factory must of had a reason to do that"...Well they probably did, everyone has a theory, but from what I've read the general consensus is that it was done for better turning radius and possibly to track better (both of these insignificant when you're talking about lifted trucks like ours).
Hope that helped
