Anyone with experience of tahoe / yukon 3rd rows.

[eighteenninetytwo]

I'm looking for a couple of words of advice from anyone who has put Tahoe / Yukon 3rd row seats into the rear of a 73, 74 or 75 Blazer. I have the seats and I have the brackets courtesy of ebay.

Two questions on my mind at this point.
1. the seats look low and there is no rear footwell with these years. How much higher should i mount the brackets in ordere to make teh rear comfortable for passangers (Mostly kids but maybe adults on one hour max journeys).

2. As a function of raising the seats a little, I am considering creating a frame of Rectangular hollw steel bar to attach the brackets to, and bolting that frame to the bed of the Blazer with the existing five rear seat 1/2" bolts. That way I could unbolt all five if I really needed to maximize load capacity and take out the rear seats without brackets sticking up in the bed.
Anyone done this? comments? thoughts? what to avoid?