I’ve pulled my Imagine 3000qb thousands of miles on a Reese hitch with 2” shank and a reducer, zero issue. Also a flat deck trailer. You will want like 8” of drop for that truck to have the flexibility towing different things.
Personally I wouldn’t worry much about using weight distribution with your new truck and trailer combo. If you upgraded to longer heavier trailer then yes.
I agree with this right here. I've been pulling our roughly 7/7500 lb loaded TT with a 2" shank WD system and a factory reducer with no issues. The only reason I need to replace the pin is because wintertime salt is making it hard to pull the keeper pin out. I can still do it but it isn't the easiest, though it makes it harder for someone to steal my hitch.
I think it's a Curt WD system I'm using, I have their 'extended drop' shank which gives me up to 8" of drop, it is set at about 6" of drop so I still have a couple holes left, but that's where my camper pulls level.
For all other trailers I have a B&W dual-ball setup with up to 8" of drop. Works well, I put it all the way down for my flatbed, about 2" up for my boat. I haven't had to have it higher than that.