is Lewis Built's HD radius arms that use a Johnny Joint and a FK rod end. downside of moving to spherical bearings and rod ends is that they will need to be replaced as the races wear out, and in a truck this heavy, i would say you will be looking at 50,000 mile Johnny Joint rebuilds.
I am running the Lewis Builts on my 2018 -
I've had them on the truck for almost 20,000 miles and so far so good - albeit most of those miles are highway - with limited off-road work.
My choice to use the Lewis Builts was predicated on their unique advantages - over other solutions - that said I considered the Pure Performance 4-link - but ultimately determined that the LBA got me the stretch I needed to accommodate a 40" tire with my AEV flares, (AEV wasn't shipping their suspension system kits when I needed a solution).
THE LBA's are burly and flex well - I've had no issues with them whatsoever.
I believe that short of running a three link with a panhard bar (AKA TracBar) the LBA give the best option for reducing the bind inherent in the radius arm set up.
I was originally running 40's on a 17x10 but went to 37's
the spring is a CARLI 3" for diesel - below is my truck from the 4th of July 2019 on 37x13.5x17 Toyo OPEN County m/t's - big difference in drivability (G56 manual) on the daily between 40's and 37's. When I re-gear and add the PSC assist I'll be back on 40's