Upgrades for a Slide-In Camper

I have a Tufport T65 camper on order, supposed to be ready in late July. I am trying to figure out what I need to do for the rear suspension, at a minimum, and I realized there's a lot i don't know.

The camper is supposed to be 650 lbs empty. I will add a basic sleeping platform, so probably a few hundred pounds added once it has all the gear. And I'll likely have a couple hundred pounds of stuff in the back of the cab. Other heavy mods include aluminum skid plates, steel sliders, and I plan to install a high clearance rear bumper and hitch mounted swing out. I'll remove the tailgate, so that helps a bit.

The goal is to have good off road capability, but realistically I will be driving it on the highway 90% of the time to get to off road destinations, so I also want decent handling and stability. I'd also like to occasionally be able to remove the camper to do truck stuff like towing and hauling, but that will probably be rare.

I currently have the TRD lift kit, 2" front and a 1" block in the back. I'd prefer the rear to be lifted more like 2" to give me some capacity to add bikes on the hitch. It looks like at a minimum I need some heavy duty leaf springs. I'm considering Archive HD springs, but I'm open to other suggestions.

Along with heavy duty springs, it sounds like I need longer shocks. Can I just put longer shocks in the stock mounting location? Do I need to change bump stops? Extend brake lines? Is it worth doing the Archive shock relocation kit to get longer travel?

Right now I have the Archive U bolt flip kit and Opt 3: Archive standard speed bumps w/ ring. I also have their hammer hangers and shackles, but I haven't gotten around to installing them yet.

Can anyone give me more specific advice on what rear springs and shocks to buy?

I am not looking at changing the front any more for now. Anything else I should consider? I'm hoping to avoid regearing, but I can do it if I need to.