I face similar issues with the truck. I drive it when I'm going off the beaten path. I definitely don't want the fly rods rattling around in the bed with all the gear. I can break the rods down in half and they fit in the back seat, but again, it's not very feasible with more than two anglers and the rods aren't secured at all.
So, long story short, I needed a rack for the fly rods. The fly shop has some magnetic ones stuck on the old shop truck, and they've never moved for as long as I can remember. But the strong magnets can scratch and ruin the paint on your vehicle. So suction cup fly rod racks were my preference. I've seen some commercially available ones that retail for $150 (looking at you Orvis) http://www.orvis.com/p/sumo-car-top-rod-rack/3l94 but I've seen some people that have made their own and in various ways and configurations. After seeing a few DIY (do it yourself) fly rod racks online, I decided to build my own. In the end I spent about $25 and it took two hours of my time.
MATERIALS:
http://www.harborfreight.com/dual-cup-suction-lifter-46134.html
1 Four Piece Ball Stretch Cord--Harbor Freight $2.49
http://www.harborfreight.com/4-piece-ball-stretch-cord-set-47302.html
2 PVC Snap Tees 1"x 3/4"-- Lowes $1.69 each
http://www.lowes.com/pd_188230-1815-464131RMC_0__?productId=3371266&Ntt=pvc+snap+tee&pl=1¤tURL=%3FNtt%3Dpvc%2Bsnap%2Btee&facetInfo=
2 PVC Threaded Adapters 3/4"-- Lowes $0.35 each
http://www.lowes.com/pd_23856-1815-436007RMC_0__?productId=1067457&Ntt=3%2F4+pvc+threaded+adapter&pl=1¤tURL=%3FNtt%3D3%252F4%2Bpvc%2Bthreaded%2Badapter&facetInfo=
2 PVC Tees 3/4" -- Lowes $0.42 each
http://www.lowes.com/pd_23874-1815-401007RMC_0__?productId=1067661&Ntt=3%2F4+pvc+tee&pl=1¤tURL=%3FNtt%3D3%252F4%2Bpvc%2Btee&facetInfo=
1 PVC Pipe 3/4" x 2' -- Lowes $1.52 (Note: A 5' piece of PVC 3/4" is only $1.92)
http://www.lowes.com/pd_351144-1814-PVC+04007++0200_0__?productId=3341540&Ntt=3%2F4+pvc+2&pl=1¤tURL=%3FNtt%3D3%252F4%2Bpvc%2B2&facetInfo=
* 1 Foam Plumbing Pipe Insulation 6' -- Lowes $1.18
http://www.lowes.com/pd_24433-1410-P11XB/6_0__?productId=3133245&Ntt=3%2F4+tube+insulator&pl=1¤tURL=%3FNtt%3D3%252F4%2Btube%2Binsulator&facetInfo=
PVC Pipe Cement -- Lowes $4.98
http://www.lowes.com/pd_23467-138-31018L_0__?productId=4750803&Ntt=pvc+pipe+cement&Ns=p_product_price|0&pl=1¤tURL=%3FNs%3Dp_product_price%7C0%26Ntt%3Dpvc%2Bpipe%2Bcement%26page%3D1&facetInfo=
* Electrical Tape
* Zip Ties
*(I had these items already so I didn't need to purchase them)
Glue and snap the PVC snap tee right onto the handle of the suction cup lifter.
Thread the adapter onto the top of the snap tee (I didn't glue it so, theoretically, I can separate the top and bottom half of the rack if needed, or turn the top and bottom pieces in opposite directions to find a flat place on the vehicle). I cut a small piece of 3/4" PVC pipe and glued it inside the adapter. This allows the PVC tee to be attached to the top in the next step.
Glue and attach the PVC tee.
Cut the 3/4" PVC pipe into equal lengths. Glue them into the PVC tee. I matched the lengths to equal the overall width (or so) of the suction cup lifter.
Cut the foam to length and slip over the top of the PVC. I secured it with zip ties and then electrical tape.
Run one shock cord through the entire length of the PVC pipe covered by the foam. The ball on the end of the cord will prevent it from sliding through the pipe. Tie a second cord to the end of the first. I used a clothes hanger to hook the end of the shock cord and pull it all the way through the pipe.
Finished product! These have been awesome! They've traveled great all day long moving around the river and haven't ever come loose! The suction cups are rated for 200 lbs. so they're very strong. I've now taken a few trips from the fly shop to the river with fly rods attached going 75 mph and no issues. They've now performed through a rain storm and a few cold fall mornings with zero problems.
The suction cups hold best on flat surfaces, so make sure you find a flat spot on your vehicle to attach them to. Now go fish!