locks fat tire u-lock

So you guys have got a stack of expensive bikes. What's the pick(sic) of locks? Chains are too big and heavy, can be cut anyway. U bike locks can be cut with bolt cutters or portable angle grinders. Disc brake locks( America, bought one) seem like a good idea, but I've read the keyways are not...

I have a Fat Tire E-Bike. I know that locking up my bike correctly is really important. It seems that a U-Lock is one of best methods to deter thieves. However, I can't seem to find one that works for a fat tire bike that would also allow me to attach to a bike rack. I'm looking for suggestions...