Home made rear bearing replacement on an E70. Similar to E53s. So it is possible to remove the rear bearing without disconnecting suspension parts. Other videos do remove parts only for easy access to the E14 bolts. So if it's a rear bearing, I can replace them in a few hours. I like his steel plate home made press. I can take parts to a local shop. The shop has pressed stuff for $20.
I owe lunch to a transmission shop crew. The shop didn't charge me to check transmission and transfer case oil levels. I towed my X5 there since it spilled 8 quarts once and probably 2 more due to oil cooler fitting. I didn't want to risk driving it until it was properly checked. The shop added one quart of oil at no charge. A few hundred miles later, no leaks. The other day though, I did notice the shifter linkage seal had oil on it. I cleaned it. I'll check again for oil. If it's wet, I'll take to the shop for a seal replacement. While it's on the lift, I'll ask if they can pin point the bad bearing. I'll use lunch as a bribe.
I've ordered one rear hub incase I damage one. The RockAuto discount section had 1 hub left on sale. Super cheap too.
Now, I'm looking for front bearing info. Thanks andrewynn and effduration. I'll link the info here when I find it.