Rookie Question about suspension

A buddy and I are doing my lift and I had a question about the rear. I did the front first with 5100s and OME 888. I have a lot of weight in the back shell and decked system with tools. So I’m looking to get 3 - 3.5” in the back what suggestions do you guys have?
I already purchase a add a leaf awhile back but it won’t be enough. Would it be crazy to use the add a leaf and do a 1.5” block spacer. Thanks in advance sorry if its a dumb question.

 

Yes you will be fine for a while until you can get a proper leaf pack. If you are putting the 5100's in the rear, I hope they are the rcd for a 3 to 5 inch lift.

 

I was wondering what rcd stands for? I think they are just the standard. Do you know how much they can handle?

 

Yes, I own a set.
There are 3 versions
0 to 1.5 inch
1.5 to 3 inch
3 to 5 inch the rcd are their extended length series.

 

Thanks for the info