Wow, those look like great roads to have fun with a Raptor! Based on those photos here is what I am thinking.
You can get a little wider stance by changing wheels to something like the Methods I run, they sit out alittle farther. Stay away from spacers, IMO.
Some other good choices out there, you just want something strong.
Those holes in the road and big rocks will explode your stock wheels, REALLY. I broke three OEM wheels when I first got the truck. They will not hold up to high speed hits, but I was pushing kinda hard.
Tires, you need to spend some money here too. I really like BFG KR Projects. They have extra thick sidewalls among other things and will save you money in the long haul. You start running hard, spinning the wheels hard and hitting big rocks and holes you will shred the OEM tires. I went with Generals for awhile offroad and they were better but still will get torn up. The Projects are the hot ticket for really nasty rocks. Be easy on the worst stuff and they will last you a long time. I spent alot of money on replacement wheels and tires before I got this setup.
Better to spend the $$ up front, you can sell your stock stuff off to help offset the cost.
attached is a pic of my wheel tire setup with Glassworks fenders. These are 37"'s. You can see that they sit out a little more than stock.