When installing spindle nuts like what comes on the Timbren Axle Less Kit # TASR5200S03 Timbren recommends tightening the nut to 50 ft lbs and then backing off 1/8 turn. view full answer...
The Lock N Roll Articulating Hitch # 336VS503505 can do a rise/drop of 4-1/4 inches but there isn't a way to allow this to also have a dual ball mount design on it like you asked about. So to cover that you'd need a different adjustable ball mount like the part # AM3411 which has a similar rise/drop but has the two ball sizes you need as well. It's pretty uncommon for the dual ball setups to have the 1-7/8 inch and 2 inch ball but this one does so it would be your best option. view full answer...