What are the best SK tank items

[Tseng]

Mithril 2-hander

Then you can solo

[Malrubius]

If you are on a budget, then you can also solo just fine with a Gigantic Zweihander or even a BIBS or Silvery 2h.

Bronze is fine for your stock armor, but Fine Plate is better (slightly better AC, much lower weight).

Upgrade the slots that make sense with Darkforge, where it makes sense.

Hitpoints, Hitpoints, Hitpoints...
-Mithril BP
-Skull-shaped Barbute
-5/55 ring x 2
-Diamondine Earring x 2 (or 4str/2int earrings if the DEs are too expensive)
-Cloak of the Ice Bear (or the 45hp cloak (forget its name) if you can afford it)

Haste item when you can afford it. Mith 2h, or fbss, or whatever else.

Runed Bone Fork in your range slot - good resists for the cost.

[Barthorn]

Ultimate twink set:
Weapon: Mithril 2H 7-9k / Dark Reaver 1-1.5k
Chest: Mithril 500pp or Brigande 1k
Earrings: Diamondine Earrings x2 1500pp, Black Sapphire x2 10k
Arms: Mithril 3-4k
Legs: Mithril 3-4k
Head: Hammerhead helm 7-10k or SSB 300-500pp
Feet: Dwarven work boots 300-500pp or Darkforge boots 300-500pp
Rings: Djarn's 8-10k + 55HP 250pp
Face: Grotesque mask 300pp
Neck: +7str, +7int 300-500pp or black sapphire +55hp/mana 5k
Waist: Thick Banded Belt 2-3k or FBSS 11-14k. (I would go with Mith 2 hand/TBB.)
Bracers: Granite Bracers 3-4k / Hero Bracers 300pp
Ranged: Dragoon Dirk 50pp or Runed Bone Fork 500pp
Shoulders: Bloodstained Mantle 50-100pp, Crested Spaulders 400-500pp
Gloves: Darkmail Gauntlets 300pp, Gem Inlaid Gauntlets 300pp
Back: Cloak of Shadows 1.5-2k, Hooded Black Cloak 2-3k

Did my best to estimate w/ prices. Not sure what you were looking to spend, but try to get Mith 2 hander/hp items before anything else