In case you're considering buying a QuickJack, as I am, the new T series may be out in the summer. No commitment from the company on a date.

https://www.quickjack.com/tl

And if you're on the fence as to whether to get a 5000 or 7000, this may video showing the former lifting over 15,000 lbs might convince you that the 5000 is fine for an E53, even with the V8: (special hydraulic unit used in the video)

https://youtu.be/YVZ-CcF0_MY

It looks like there is a long (X) version of the 5000 series.

I read they're also working on a full caster set as an option. In one post, a person linked to somebody who is selling custom made ones on Etsy for $300.

https://www.etsy.com/listing/9102968...for-quick-jack

Edit: In case you're wondering, the brackets are designed so their wheels come off the ground as soon as the jack starts to lift. Quite clever!