I have had great success by employing range of motion (ROM) progression in my deadlift training.
Tim Henriques wrote about it here
http://www.T-Nation.com/training/new-way-to-deadlift
And I covered my experiences here
Basically, start with a partial deadlift off of blocks or mats, and each week very gradually reduce the ROM until you are pulling a full deadlift with a weight you could previously only get a partial with. I use rubber patio tiles for this, and if you cut them in half you can transport them to the gym in a duffel bag. Using this approach, I managed to get a 650lb pull at 200lbs bodyweight.
Granted, it was ugly as hell, but it counts in strongman, haha.