I also have John head of household 1830 Stonington 10 in family with 3 boys and 4 females.
I have a John Bent testifying in 1842 on a Providence Protection oath of G.S. Dennison. Then in 1850 he is a waiter in NYC age 49 B.Ct. In 1860 in New London he is "Indian" age 60 b. Ct. 1800 with a wife Harriet age 65 "Indian" b. Ct 1795 .
There is a protection oath for a Prince Bent b. Hopkington age 45 in 1805 in Stonington Custom House records. The other Prince Bent is probably Prince S.(Stanton?) Bent who died in Sacramento Jul.7 1892 (b.1824) probably of John and Abby(?). Jesse was also b 1824 resided Sonoma Analby Ca.
So your Margaret Peckham may indeed be a first wife. There is Julia Ann Bent who also was b. around 1824 who we know was a dau. of Prince Jr and an unknown wife. What a web they wove!