My $0.02
A lot of good advice in this thread. I'll add mine (with no claims as to its quality)
I think the most important factor when driving in wet road conditions is driving skill. You have to have a good "feel" for when your tires are going to break loose. When you know about where that limit is, stay well away from it.
You eventually get a feel for what speed you can run through a turn. That speed is slower for a tighter turn and a little faster for a wider turn. You get a feel for how fast you can accelerate and how fast you can apply brakes, and then you learn that those things get much worse when you're trying to brake or accelerate while in a turn.
I've been driving mostly VW Beetles or light 2WD trucks throughout my life. To make matters worse, I used to put retreads on my VWs. $15/ea installed. I was never into spending too much on tires

The point is that most of my life I've been driving vehicles with crappy traction. I've learned what it takes to get the tires to break loose from the road and acquired a healthy respect for that limit. You control the speed, braking and acceleration. The road has different surface qualities, turn rates, inclines and declines. You just have to learn to live and drive safely with it all.
Usually, if you're a safe and conscientious driver to begin with, you won't be driving beyond your truck's ability to maintain traction. However, until you learn about where those limits are, you'll be given some gentle indications. Maybe the back tire will skid a bit when you start from a stop sign. Go easier on the clutch. Maybe one, or all, of your tires skidded up to a stop sign. Slow down and/or start braking sooner. Maybe you're taking a corner and start to feel or hear the front start to slip a bit. You're driving too fast for that turn-rate and surface condition.
This is no means intended to promote careless driving. Don't go drive faster and faster in the rain until you end up in the ditch. I'm just trying to say that throughout our driving careers, we all learn the limitations of our vehicles. Most of the time it's just a learning experience; no metal gets bent and nobody gets hurt. Bottom line is to go slow and take it easy. Heck, pretend you're driving on ice.
Better tires increase traction, no doubt about it, but you can still, even with the best tires, easily drive beyond your tire's ability to hold the road, so driving skill is still necessary. Where it might matter more is when things happen that are beyond your control. Someone pulls out in front of you, etc. Better traction might save the day. It'll definitely let you get away with more drastic actions. Beyond that, it's a game of maneuvering to limit the damage
I used to put about 50lbs of sand in the front of my VW. Weight helps. As was pointed out earlier in this thread though, there's a limit where extra weight starts to become a liability.
Cary