Indeed, the statute of limitations on chattel mortgages was considered implicit in the four-year period for debts (found formerly in article 5527). Alexander v. Ling-Temco-Vought, Inc., 406 S.W.2d 919, 924-25 (Tex.Civ.App.-Texarkana 1966, writ ref. n.r.e.). Consequently, the "lien followed the debt, and was not barred so long as the debt was not barred."