Hmmm; I don't remember being able to even build those "huscarls" but I've only played Denmark once in early. Somehow, I thought they could only happen as rebel troops. I remember that it can be tricky - going after Sweden and Norway as they are fairly poor provinces early on seemed to actually drain me so that I couldn't build much and large garrisons had to be kept to prevent revolts. It may be wise to wait as I assume he did (didn't watch the video - they are always tiresome to me :) ). Denmark has an early ship advantage - the longboats are a good first ship and cheaper to build then others so I agree with Ferdi that ship building should be an early priority.
Sorry; I have no clue about your load problem - I'm just not technically inclined so I couldn't answer in that thread.
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