Bank barrows are not common , possibly only 6 in Britain .They are massively elongated long barrows most without a primary burial and are closer to a cursus but narrower . Auchenlaich ,Kilmany and possibly the Cleaven Dyke fit the bill.
Auchenlaich sounds a lot like Long low in description, which imo doesn't fit with the Dorset Bank barrows using a comparative approach beyond the fact its a very long mound used for burying people.
On the subject of Bank Barrows, Formicant (or anyone else nearby) there is a very Dorset bank barrowesque mound pointing straight at Pen Hill long barrow on the edge of the Mendips. So if you are round that way at any point...