cost is, i believe about $160 i really dont remember.
i think adding to a body lift to a truck which does see some pretty heavy fourwheelin. is okay..and not too much of a problem. In my opinion, the only 2 things u SHOULD NOT do with a body lift. is Catch air, and go rockcrawlin, in extremely twisty terrain. other than that it should be perfect for added height and clearance. Me for example I'm always in the Mud. so its good and not a problem. As a matter of fact, its PERFECT because now i have to force myself to not go airborn in a heavy truck and start breakin stuff everwhere. :)

Installation is actually pretty easy. I used the Trailmaster 3 lift, It comes with everything u need to install the lift completely, except for REAR bumper Brackets. i'll tell u where u can find em later..

Installation is pretty much straightforward. Majority of the kit is bolt on,* EXCEPT !!!* for follwing.

1.) The steering shaft( which u must remove). Must be cut in a certain area. Then u must WELD on the included Extension.
2.) The additional Metal bed support pucks get WELDED on between the frame and the bed.
3.) Transmission Shift Linkage also gets an extension, u have to remove the Shift Linkage, cut in a certain area, Then Weld on the INCLUDED extension

The Front Bumper Brackets ARE included (but i cant use em cuz my bumper isnt quite OEM). As for the Rear Brackets, i bought mine at.
http://www.fabtechmotorsports.com/tube/tabs/tabs.html
Just call em up and say u need the rear brackets.
hehehe. Installation of the rear brackets, is not HARD, just requires thinking. i actually sat there on the parking lot, looking really dumb, staring at 2 pieces of 1/4 inch think (!!!) metal brackets.  for alittle while trying to figure out which way does the brackets go. it was actually kinda fun. but just thought i'd let u know.

The Transfer case Shift Lever, DOES NOT need modifications contrary to common belief. it just gets sunk in to the floor abit. but u can still shift no problemo. i suppose if u feel like removing the lever and spending hours on it just trying to regain 3 inches of lever length, then go fer it, but i just left it alone.

something has to be done to the gas tanks fill tube,U get a little piece of rubber extensions, to let the gas tank, reach the filler entrance, ( the part u stick in the gas pump.) i feel abit dumb right now, cuz i cant think of the name. :)     but i think u get what i mean.

Now just to save u the money of installation.  what u should do is. install everything u can by you. the only welded part u cant take with  you is the additional bed supports. but thats not very important at the moment.  So u should take the 2 linkages. (steering and Trans Shift) to go get it welded some place.  then come back then finish off installation, then go back to the same place and get the  bed support pucks welded in. This way would save u alot of money installing everything yourself.

Anyways, thats the Only parts that are actually ..not bolt on..   in general it was actually pretty easy. , and would take about half a day. or the better part of the day. its much easier if u have a helper.