70 lbs is a lot. Have you ever bike toured before, I'm not sure if you've mentioned this before.
I assumed the 70 pounds included the bike, racks, empty weight of panniers, etc. My Tubus front and rear racks, pair of Front Rollers, pair of Back Rollers, and 31 liter Rack Pack weight 6 kg, empty weight. Even if it was a light weight bike, that is already getting heavier before you add gear.
We probably will find out soon enough