here's my advice that's worked for me. take your wife out to dinner one night and then afterwards go look at trucks. This is the BEST time to do it(or on a Sunday afternoon). you can take your time walking around looking at what they have on the lot, get a feel for prices, see the different equipment packages the trucks have, etc. All this without a salesman breathing down your neck. They know many customers do this that's why they have stadium type lighting that they leave on at night

Make sure to take a pad and pen with you. Write down the price of the truck(s) you like, vin number, options you liked. Here's where the REAL work comes into play. now you have to research many hours to search forums of what people are saying about the truck(s) you are interested in, get a feel for pricing(won't be exact but you'll get an idea at least), go to the manufactures website and see all the rebates they are offering. When you step on the lot you should have a price figure in your head with SOME flexibility(not much though). An educated buyer is a salesmans worst nightmare.
I'm lucky in that I personally am friends with a salesman at a GM dealership and I know he's going to give me his BEST price right up front. no b.s. with him, no more wiggle room, it's the dead set price and 90% of the time it's the best price of any other quote I've gotten. he's mainly the reason why I'm driving yet another GM truck instead of something different.
I just spent tons upon tons of hours doing research, I joined forums ans asked questions to the owners that owned the exact trucks I was interested in(there are some very informative ones here so don't overlook this site!). Just don't go in blind expecting a great deal, they will rake you over the coals if they see they have a sucker. if you walk in with a manila folder with different price quotes, information about exactly what you're looking for, then they'll know they can't pull a fast one over on you and will more then likely be straight up with you in the beginning. again, I'm lucky in that I personally know my salesman and don't have to do all of this, I just walk in and say "hey what do you want for that truck?" and he will shoot me a price....his very BEST price. it's why I've bought my mothers car from him, bought my new truck, and will be sending my dad to him shortly.
Little silly tricks and tactics don't always work, they can but do you really want to jump through all of those hoops and waste half a day getting jerked around? my time is more valuable then that. Just tell them what you want, what you're willing to pay, you will give them xxxx amount of time to either put the deal together or you walk. it's only a vehicle, remember. they make new ones everyday...thousands of them. you don't have to buy a truck, they have to sell you one.