roof top rod holders

I just got a new 2008 xterra, it was time to get rid of the explorer 2001 with 215,000 hard miles going into manhattan. My problem is the xterra being so tall there are some parking lots that I do not fit into. I had a home made rod rack on the truck that held 4 rods. I had it bolted onto the top on the truck. I am looking for something that would be easy to put on and off when I need it. I was able to put some bungi cords inside the truck for one rod for that before or after work run,but I would rather have something on top. any one have any solutions.
Thanks