deksawyer
E*POWAH Master
LITELOK X3 or Hiplok D1000/DX1000. The weakest link then would be what you attach them to.
www.litelok.com
hiplok.com
hiplok.com
Pragmasis chains and anchors are worth a look as well.
None of the above are cheap, but when all your toys are stolen in the middle of the night, it hurts. I know.

LITELOK X3
The World's Toughest Bike Lock. 20x more angle-grinder resistant than the best performing D-lock, the ultimate in bike security.


Hiplok D1000: Anti-Angle Grinder bike Lock | Hiplok
The Hiplok D1000 is sold secure Diamond and the first anti-angle grinder bike lock. Designed to stop angle grinder attacks,


Hiplok DX1000: Anti-Angle Grinder Motorcycle D Lock | Hiplok
Motorcycle D Lock. 1000 Series - 1st Anti-Angle Grinder Motorcycle Lock. Sold secure Diamond & ENRA approved. Features Ferosafe. Independently Tested

Pragmasis chains and anchors are worth a look as well.

Security Chains
Security chains are versatile and a great way to secure motorcycles, bicycles and plant equipment. Our chains are made from the best-quality premium hardened steel and have been independently tested by Sold Secure.
securityforbikes.com
None of the above are cheap, but when all your toys are stolen in the middle of the night, it hurts. I know.