I would also recommend wearing Troll Armor with a Bronze Buckler, as you're going to have the "Wet" debuff pretty much the whole time you're there. You'll be able to move faster and avoid the deeper puddles with Leeches. The buckler is for the Archer Draugr and Skeletons who'll snipe at you.

You would also do well to hit up your Trader and obtain the Dverger Circlet and Megingjord. The crypts are dark, and Iron ore weighs a little more that Copper, so the additional 150 carry weight comes in handy hauling loot. Also, I like to bring both my Antler and Bronze pick axe when going in, using Bronze first and Antler as a back-up.

You only need 10 Bones to summon Bonemass and they weigh a decent amount. You'll find them in chests, on the ground and in the mud piles. Once you get 10 you don't need to worry about them unless you want to kill Bonemass multiple times. (Just to save on carry weight).

If you play with friends, I would have one person carry all the gold/rubies/amber, yellow mushrooms, etc. And the others carry as much ore as they can, increasing how much you can take back to your boat. Recommend having a Longship as well for the large storage capacity.