Im looking to mount some offroad lights(Hella,KC,ect) on my luggage rack I was just wondering how hard it would be to do it and what lights are good and also cheap its an 03 if that helps.

simple search reveals many many threads on this subject. But ill get you started heres a thread i remember i posted in, you can see my lights on my roof rack.
http://www.blazerforum.com/forum/showthread.php?t=27946&highlight=roof+lights