My Dodge PW (2500) is rated to tow 10,000 lbs, and I understand Power wagons are rated for less than diesel 2500s. What's your 250 rated for? I'm guessing it close to what you're looking to tow. Look at what you're rated for, look at any upgrades or preparation to mitigate your risk, then make the risk decision if you're going to go beyond factory rating.
Personally I won't go beyond what the factory rates it for even if I think it'll do it, but that's just me. Go for accessories that are rated beyond what the truck will do so as to eliminate any possible weak links, top notch maintenance, and of course driving habits that lower stresses on equipment and loads help too.
Just noticed youre just up the road from me
. I do t think I've seen another privately owned MV in the area since I've been here. Always good to know there are fellow SS's in the area. Good luck with the trip!