I have mine set up so the entire mount comes right off when I am not using it. It takes about 2 seconds to take off and about 3 to put on. I went to Home Depot and bought a 9'' x 9'' drainage grate, cut it to the size I wanted, then bolted the base to it. A short shock cord and 2 eye hooks keep it in place perfectly.
You can check it out by going to the 'Rigged Kayaks' section then "Mike's (TOTE) kayak trolling rig....". Mooch was kind enough to post a few pics of it. I also used the same grate concept for my downrigger. The material is impervious to the elements, even salt water, and is very easy to work with.
Tote

I have a Yakima rack with the Land Shark saddles and they work GREAT.
I have never tied down the bow nor stern when traveling and I drive about 500 miles round trip to fish the coast. I used ratchet tie downs and the yaks are very secure. I have had a many as 5!! stacked on top of my truck with only the 2 sets of saddles and didn't have a problem.
I also have the EZ loader bars inside the Yakima bars. They extent out from the regular bars so I can set a yak on them, get under the yak, then lift it onto the saddles. I use one of the EZ loaders when I am loading by myself. I will use both of them when I am loading more than 2 kayaks. I set a yak across both bars, get under it, then heave it onto the others. This is something I can do by myself and have had to many times when taking kids or a short date paddling.
LOL
Tote

Cool pics Mooch. Thanks for sharing!!

I will try to answer some of the questions about the trolling rig.
I put this on to troll for macks in Tahoe. I haven't used it in the ocean. There are a lot of variables involved when using it on a yak. Getting snagged is my 1st and foremost concern. Wire cutters are kept right next to the downrigger at all times. I feel safe in a lake, a little worried about having 150 lb cable getting snagged in the ocean with current and swell to deal with. I am sure in DEEP water it wouldn't be a problem, just wouldn't get it TOO close to the bottom.
Because you have to maintain some forward speed while lowering the ball, I have the rig mounted in the front. I can get going a good speed, scoot forward and let some cable out, then paddle a little more, let more out, until I am at my desired depth. If you don't keep up a decent speed, your line and the cable will get tangled.
I also want to maintain a constant visual on the whole thing. It is easier for me to lean forward  to handle anything immediately that might occur with the downrigger, i.e., hook-up, snag, sudden change in depth. I can keep an eye on my fish finder and downrigger at the same time too.
I like the fact I can have it on either side of me. A rudder would help a lot, but I don't really use it enough to warrant one.
It is far enough forward so it does not impede my paddle stroke at all.
It is not permanently mounted either. the straps keep it in place just fine, and if I want I can easily remove it and stow it below.
I always get my feet in the water when I fish one way or another. I like the comfort of the position, so I have no problem straddling the yak to reach the pole. It is 2nd nature to me.
Hope this helps.
I will be glad to answer any other questions should they arise.
Tote

I had 4 uniden JIS 7 person to person radios. 3 of them shorted out when our kayak decks got swamped. They were supposed to be safe at 3 feet for 30 minutes, yet they failed at 5 '' for 5 seconds. Uniden replaced them.
I would keep your cam in a small dry bag, at the very least a baggie, just to be on the safe side.
Tote

I was thinking we could still sign up Satuurday morning. If there are no sign-ups on Saturday PLEASE let me know. I would hate to go all that way and not be able to enter. Still working on the boss to get off early Friday. Won't know until this evening.
Tote

I tie a big # 4 heavily weighted all white wooly bugger with bead eyes and use a shooting head to get it down quick.
About 5 seconds after it hits the water I start stripping it in and WHAM!!!
Fish all day!
One word of advice, pinch the barb. I had a gust of wind come up just as I was hauling my line out and the the fly hit me in the back of the neck. Damned near KO'd me. I thought for sure it impaled me, until my rod bent with another fish. The fly bounced off me and landed in the water. I got lucky. I would recommend pinching the barb down so if you do get nailed in the back it will come out easily.
Tote

I drove from Placerville, 45 miles east of Sacramento, to participate in the derby on Sunday the 17th.
As a group, the participants were some of the coolest people I have come across in a long time. I just wanted to thank everyone for a great time.
I was truly amazed at how friendly everyone was, on and off the water.
You all made it a memorable experience and one I will be doing again for sure.
Mike