My bronco weighs in at 4K lbs. but I don't have anything in my recover kit rated at less than 15k lbs. There's no such thing as "too strong" when it comes to recovery gear. Too bulky, sure. That's where the strap vs. boat anchor chain argument comes in.
If you know a good dealer, you can probably buy some military surplus straps that are a bit cheaper but still plenty strong for what you want. There is nothing wrong with over building a recovery kit. The only real limit is how much you're willing to spend.
As for snatch vs. static lines, it really does depend on what kind of stuck you have and how you can get unstuck.
Scenario 1. You're buddies jeep is trying to make it up over a bolder, but is "stuck". He just can't get traction on the rock face. Solution. Static line and pulls his tires against the rock face, thus giving him traction to drive up it. All your buddy needed was a little extra force acting down on his tires to the rock face, allowing him to pull himself up. While a kinetic line might work for this as well, you can't shorten it if you needed to, like you could with a chain or static line.
Scenario 2. Same jeep, this time, sunk up to the axles in thick, clay mud that just runs back in if you try to shovel out a channel for the tires. Solution: Snatch line that pulls him forward slowly till his tires get up on top again and he drives out. The advantage of a stretching rope is that your buddy can keep his foot on the pedal and try to work himself free and onto solid land again as you're pulling. The kinetic line will be absorbing the sudden shocks as he goes. With a static line, he just sits there and hopes your rig has enough power to dead pull him out.
You'll notice that in both scenarios that the stuck vehicle is helping to pull itself out. If the stuck vehicle can't help itself get unstuck, then its less vehicle recovery and more wreck recovery and you'll want to leave the straps out of it and seek professional and experienced guidance.
Like all skills, it all comes down to knowledge and experience.
Here is what I've got in mine so far. I've got a couple of heavy duty shackles coming in to add to this so its not quite complete, but its enough for now.
1 25 ft. tow strap with hook and loop ends, 1 12 ft. recovery strap with looped ends, 1 6 ft. tree saver, 1 twisted shackle, chain, duck tape, 20 ft. of 3/4 inch rope, and keep it all in a canvas tool bag. Except for the rope, everything is rated at over 8 tons.