eah there is that ... I was speaking in reference to going down not up. An "assumption" on part ... my bad.Yeah they make them for a reason not saying it's the best thing to do for bearing seals. Factory wheel offset going to a x10 does the exact same thing as putting a 1.5" spacer on factory wheels. The bearings can take the added stress. Instead of 200k miles before replacement maybe go 150k miles. If you go to a x14-x16 and 2wd the front end will break hubs in 20k miles. So it's very safe to run 1.5" on stock wheels.
Lifted trucks do "funny things with wheels" not a "tucked" wheel kinda thing. Some of us go up and some go down ... I have no idea what a "proper back spacing" is on a lifted truck???