IMO the 5100s are very good in that application. Don't forget, once you get longer shocks, check to see that the brake hose is still long enough. This brake hose writeup might be helpful. If you use a shock longer than 2" (in the stock location), remember to check the bumpstops to be sure the shocks won't get compressed too much. If you decide to relocate, try to keep the factory angles for the best ride.

Also, sometimes when you add fatter shocks, the leaf will hit (and dent) them. Here's an idea for spacing them over so it doesn't happen.

Wheeling a Stepside Tacoma on 37s
Exploring in a T4R Ltd V8