"Any good documentation out there on installation?"

http://www.danielsternlighting.com/
http://members.aol.com/Fkc43/hdltrela.htm
http://www.vanagon.com/info/articles/upgrades/headlight-relay/

If you were to read everything at those three links you'd acquire much of
the information you're looking for, but not nearly all that is available
from "retailers" on this list.

I put the relays in and have 80/100 9004's and 100w in the high beams. Much
better but still a poor light pattern. I also have the Hella driving lights
that come on with the brights, and they simply flood the night road with
more light than I need, but it's nice.

bob