The ring in the cairn was created following the guidelines in the FC, and thus uses the Miscellaneous Items table.
Ring of Swimming
This item grants a +3 bonus to the Swimming skill.
I looked online to see if there were stats or suggestions for using bear traps in Savage Worlds and saw that The Day After Ragnarok (Atomic Overmind Press) has them as Gear. It would be a bit much to buy the pdf just for that! (Awesome as the setting is)
Instead I took some inspiration from this thread at the Savage Worlds forum.
If triggered, the character’s foot is caught in the vice, causing 2d8 damage and reducing his Pace by 1 until properly healed.