need to transport Kayak?

Most people get a roof rack for transporting kayaks. The most common brands of aftermarket roof racks are Yakima and Thule. You can get a rack that clips onto your door frame, onto rain gutters if your truck has them, or onto tracks that get mounted directly to your roof. I'd recommend the latter even though it costs a little more since the rack is much more solid and won't scratch your truck. The whole setup will cost somewhere between $300-500.

In the western US, Rack N Road is a good store to check out for racks (as well as some trailers). You can also check local kayak shops, outdoor stores like REI, and even bicycle and ski shops (since bikes and skis use the same rack, just different attachments).

If you want a really cheap solution, you can just get a couple foam blocks, set them on your roof, set the kayak on top, and run straps around the whole thing and through your doors. I've seen this work well, but do it at your own risk!

There are only a few reasons to use a trailer instead of a roof rack: if you're carrying several kayaks, if you have a car that can't take a roof rack (such as a convertible), or if you have trouble loading your kayak because of the vehicle's height (although there are other roof systems available for that problem). Otherwise, the trailer is just more expensive and a pain to deal with.

Kayaks can be carried atop vehicles. We have loaded 6 at a time and moved them about. There are commercial 'tie down kits' available. Make your own. Lay a strip of carpet or ethafoam on your roof top. Tie the bow of yoyr kayak to the front bumper and the stern to the rear bumper. Run a line over the your kayak and through slightly opened windows and tie securely. If your vehicle has a roof edge you may be able to find 'clips' that you can use to tie the cross-kayak line to. I have seen inflated innertubes used in place of carpet padding. If you expect to do much boating, have a suitable roof rack installed.