It's been helpful in answering a couple of my earlier questions. Regarding the swearing of commissioners and board members, the 1821 statute is much clearer as the the nature of the oath:
[...] shall be sworn to the faithful discharge of their respective trusts, as town officers are; [...]
This makes it pretty clear that the constitutional oath of office should be used, and the oath should be taken before an officer authorized to administer oaths, such as a Notary Public or a Dedimus Justice.
The original law also had a 50% quorum requirement ("[...] the major part of the proprietors and rightful occupants so assembled shall have full power [...]") which disappeared in the 1954 recodification. The original text of the second 2007 amendment (LD2102) reinstated a 50% quorum requirement, but this was removed before passage. Since the Legislature has removed the quorum requirement once, refused to reinstate it later, I think we can can conclude that the Legislature did not intend to require a quorum at meetings of owners.
Interestingly, another LD2102 amendment which failed would allowed owners to appoint a proxy, but that proxy may not be another owner of a parcel benefited by the road or way. That seemed like an odd exclusion; just as well that it failed.