Welding Cable will get you there. I'd personally prefer a single run vs a dual run if it is possible.
It seems the ready made warn wires would be rated for the task, and length though for your purposes. Bigger is almost always better with wire like this though. I don't think I would go with an inexpensive set of jumper cables (
Warn makes a set), usually when you get into it, you find the insulation is quite thick, but the wire leaves a bit to be desired. You'll also have the added planning of having the correct crimping tools for the Anderson connectors, battery connectors, etc.
A 2nd disconnect relay can be obtained separately, it was in the links, though, I don't see why you can't use one, and connect both front and rear wires to it. You are not going to use them both at once, and that will simplify the installation. The only other suggestion would be an an Anderson disconnect at the battery for convenient disconnect perhaps.
You will need to allow for some provisions for grounding. Your battery cable negative to body ground should be as large as your main power cables. The winch I have has 3 cable connects, + - and a ground wire to body. Some folks just use the ground provided when you bolt it to the body. I'm not sure how critical that one is..
The red Anderson connector on the left in this
picture is + and - quick disconnect outside the battery box. In your instance, you'll have it at the winch on both ends of the vehicle. The wire used is the warn I listed, with added heat shield.
Finally, you can significantly cut down on the amperage and increase pulling power by using one or more snatch blocks. Get at least one, I like the ARB, smitty built also makes some. At least a couple of shackles would be handy, I like smitty. This helps on a number of fronts, the more wire/cable off the spool the better it will pull, the less load on the motor, the better it will pull. You can also consider shorter cable on the winch to help pulling power (less turns on the spool) I use an 80' and carry an extension.
I hope this helps, just my opinions, this is always a highly debated subject.
Good luck with your installation.