I use a 4' Krypto Chain and ulock. Chain locks back wheel to frame and what it's being locked to, and the u goes thru the front wheel and frame. Initially was going to leave the chain at work, but I take both everywhere I go, leaving them in the rear panniers. On a recent camping trip I used this method to lock the bike to a sign post while I slept in the tent. Sure it's heavy, but I spent a bunch of dough on my Surly LHT fully accessorized with Surly front and rear racks and 2 pairs of Ortlieb rollers so to me it's worth it. I couldn't bear to have it stolen right now.

I call it 'resistance training'.