FB are valued way too high on the trade meter. Full backs are not worthy of a high round pick. In my trade, I offered a fifth round pick for a 68/70 fullback and it was favored on side of the fullback.

Is full back the player's best position?

fast FBs transition to good HBs pretty easily.

Didn't even think about that possibility

I think a good FB is worth more than a 5th round pick.

Assuming a FB has all the skills I'm looking for, I would go as high as a 3rd for the right player.

But, I usually have run-focused offenses.