I gotta agree with Greybeard. The lift kit will move the body up higher, but the lowest portions of your truck will still be the same ( diffs, tranny, t-case, etc ). The only way to get better ground clearance is to install taller tires, which will affect final gear ratio. To overcome that, folks usually install lower gears, F & R., especially when dealing with an underpowered rig like you have .Then, since you started with a 1/2 ton, you will reach a point where you start to overstress your F & R components, so they will need upgrading. It goes on and on, eventually making it a money pit, and seriously comprimising on-road useage, milage, drivability, etc., etc., etc.
Since it is your work truck, that you need to make a living, I'd say leave it alone. If you get to that questionable type of trail, get out and walk. You'll be healthier, and money ahead.
Mark