thats alot of effort though lol but thats a possibility too
the d30 works out fine overall, i wont need anything stronger at this point of the life of my truck. if your looking for an easy, and fairly maintenance free 4x4 driveline a solid axle is the way to go, and if you do leaf springs you can keep it really simple, and durrable for all season driving. its just really important to keep it safe, just because you will be a risk to other drivers on the road and your passenger doing any modification like this. if something goes wrong, it will happens fast.. make sure your capable of the project and plan far ahead for all the expenses because its also not a cheap project. i dont reccomend any sas'd vehicle for street but i know if its done correctly you can be safe about it..
thats my build if you wanna start going through it, there should be enough info there to get you interested, but there are a ton of links on here that helped me get through mine.