I want to put a lift on my trucks. I'm told suspension is the cheapest, so that will be my route if that is true. First car in question is a 2001 ranger 2x4. The truck is boringly short, so I want to lift it. Is there a specific full-suspension lift kit for these trucks, and how much would a shop approximately charge with parts to put it in? Or is it relatively easy enough to put in myself? Also, would any auto shop that deals with suspension do that, or do I need to find a specialty place? This truck also has an issue with hauling. I put 20 bags of mulch (aprox. 400lbs) in it and it almost sagged right to the ground. while my other much older, smaller, and way more shot truck holds over 800lbs like it isn't there. Is this my leaf springs? truck sits fine with nothing in it. should I replace the springs or do one of those add-a-leafs?

Second truck(the decrepit more powerful one!!) is a 91 sonoma 2x4. I put some bigger tires on it hoping that would lift the truck a bit, and it did, but only in the back. but that's because I couldn't put a tire size to match the back on the front because it doesn't clear the wheel wells. But even then I don't think it would raise the front up like I'd like it. So, I definitely don't want to raise the back at all, because it is actually higher than I anticipated. Is there a kit for a front or back lift I can buy for this truck? I'm assuming all a lift kit is is a firmer and longer spring, and bigger strut. But I do have another s10 (92) that I'm considering doing a full suspension lift on it too because it has really nice big tires but looks awkward with the stock suspension, and would look way better lifted a couple inches. So would I have to buy 2 full s10 kits, and only use the front parts for the 91'?

Thank you all in advance