Didn't read the thread as I gotta run..

I have a 2dr and am just over 6'1 and have slept in the back of mine on multiple ocasions.

fold the front seats forward all the way, back seats down, put the headrests down and a foamy over top(holds the headrest down and protects you from tie downs, or whatever. stretched out my head just hits the seat and my feet just hit the tailgate.
I usually tent it but for 1 nighters when I don't have my Jimmy loaded with camping supplies I just crash in the back, have gone a long weekend in the back with the g/f with no issues(forgot tent somehow haha)

If you have an overhead console the back seat lights work great when you need to see too!

 

ive slept in the back a few times and i agree, fold the back seat head rests down and fold the front seats forward and your fine, im 6'1 to. i throw my bags in the front seat and i have a rooftop box i through a bunch of gear in as well

 

I found three options online for my '02 Blazer, experience/comments?

Add-A-Cabana

SafariSoftshellSleepers

Midsize-Truck-Cap-Tent

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that camping pad is the bee's knees!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I have an archery hunting/camping trip coming up in late August and I always tent and cot it for the week but that was when I had a dodge ram, and now that I have my blazer, I am going to make it a point to spend a night in it.......

 

I'm 6-1, the back of the truck should be good to sleep in, just make sure you gets some padding, those D-rings can be a bitch. The fold-flat seats are great.

 

Looks like my 5'8" actually came in handy for once! I just spend a couple nights at the lake camping in the Blazer. I think with a memory foam piece cut to fit around the wheel wells, it would be great. No sand or bugs or moisture inside as opposed to a tent! You can always open the triangle windows to get some air too.

 

Ive slept in the back of james more times than I can count. Im 6 ft and with the seats down and 2 sleeping bags I sleep like a baby.