Tow Vehicle Feel

Side stepping the 1/2 ton issue. Have you actually done a complete WD setup? That is have you measured your trucks front fender to see if you're returning it close to it's original height? That would be the 1st thing to get in order. Then apply the 2nd friction sway device. If those two items are addressed and you still have the loosey goosey feeling then tires could be the next step. E's aren't necessary. D rated tires will be enough of an improvement over the stock P tires. D's are cheaper. IMO from personal experience towing close to what you are towing and having replaced P's with E's there's not a night and day difference between the two. E's won't make your 1/2 ton a 3/4 ton light. With that being said all the little improvements should accumulatively return a better tow. If they all don't then it's pretty much a 1/2 ton issue.