I have timbrens on my 2007 tacoma and a fwc. The truck drove like they weren't there for two months before I got the fwc. And it rides fairly smooth (considering the extra weight) with the fwc. No bottoming out. In fact.. with the fwc loaded and ready for a trip (about 1000 lbs) it settles right at where the timbrens start. About an inch. Now I read in this thread and in several others complaining that the 2nd gen shocks are weak, etc etc etc. Now I have a regular cab/bed 2wd truck. Is this weak suspension issue that others complain about a 4wd only issue? Because it isn't something that I've experienced.
Wow, interesting.
Are you sure you have the stock leafs? Did you buy the truck new?
For the stock springs you should drop about an inch with 100 pounds in the back, not 1k.