Yup, this is what you need .
I have one on my car as well & it’s an excellent piece that will do a great job supporting all that weight & bonus is it will never rust , since it’s made from stainless steel 👍
Don’t see any issues.
I used to own a set of -15 /-23 offset GNX replica GTA rims & had them mounted on my GN with the same 245-50-16 front tires & 255-50-16 rear tires with absolutely no issues what so ever.
Got my used Stainless Steel unit from Brian @ GBody Parts. The SS units came on the Limiteds & are much stiffer than the metal units & will never rust .
Had it media blasted and painted satin black