I would look into dobinsons and order them from CrikeyMike at Exit Offroad. Hes always answering questions and helping people out in his Dobinson suspension thread, his dedication to helping other is where I'll spend my money when I upgrade from stock boi status.
I've definitely seen a few build pictures with rake for towing overland trailers or more rear weight in that thread, so looking through that thread might yeild a picture of something you're going for.
He has a really good thread on all the options here:
Dobinsons Suspension - 4th Gen Options