Suspension Recommendations

Hey all,

I have a 2008 ACLB MT with almost 100k miles and I've been thinking about suspension lately. In May I'll be picking up a Go Fast camper and building the truck out for that, and I expect I'll be running a good 700 pounds or so in the bed rather consistently. I won't be crawling or doing heavy off-road trails, but will spend a fair bit of time on dirt roads and such. I'm not seeking out a lift just for cosmetic reasons, and I don't need a $5k suspension upgrade, but I definitely want to do the right thing here for my needs. What would be my best course of action? I'd like to get away with new struts, front springs and add-a-leafs like this -> but I'm not sure if even this is enough. Would I need to add airbags to this? Also, how much lift can I take without messing up other stuff under there? I have heard about replacing a needle on the diff case on the tacos, would I need to replace UCA's too? Anything else you could suggest?

I also plan on going to a local suspension shop and talking this through with them too - so don't worry about me doing something stupid based on something I read online. As I said, my whole goal here is to do things the right way.