Yes, it is supposed to be very heavy and generally not moved by less than two people, but capable of being moved by one. I imaging a Swartznegger type could handle 175 lbs quite easily.
FWIW, and this in no way contributes to my belief or disbelief of this 20 suitcase claim, I can deadlift 295 lbs in three sets of 10, seperated by a 1 minute rest period between sets. Now, that's dead lifting, not a lot of walking, you see. However, I have walked around with the weights/bar when they were loaded to around 200lb without too much of a problem, and 175 would be do-able for a quite a distance before I would absolutely, positively have to put it down.
Don't know how much this has contributed, but it is possible for a fit/strong person to carry around this weight for considerable distance.
Now, on to the subject at hand. We'll soon know if any of this is true or not in the next 30 days. Their "government" doesn't have that much time left on this earth, and OBL even less time. If they plan on carrying this out, it would have to be fast.