I too am researching Reuben, my ggg grandfather. I've only begun the search apprx one month ago. Don't know what you have so I will give you a few short snippets of what I've found as of today. I'm still going through microfilm and have more on order.
Born- NC abt 1798 could be Jan 1799
Married-27Apr1824 Sarah McCool Mont. Co., AL
Child Born-Alabama 1833 William Andrew Green
Bought Land-4Nov1834 BL Huntsville/TWP17S Range 12W Sec31 40.17 acres
Child Born-Alabama 1837 Tilman/Tillman H.
Bought Land-20Sep1839 BL Huntsville/TWP 18S Range 12W Sec 32 161.3 acres
Child Born-Alabama 1842 Hepsabeth
Child Born-Alabama 1846 Doctor
Married-Amite Co., Mississippi 2Apr1857 Sarah Mercer Strawn dau of Balaam Strawn and widow of James Jackson Mercer.
Child Born-Mississippi-24Apr1858 Alabama
Bought Land-Arkansas 2Jul1860 BL 05 Meridian TWP 4S Sec 30 Range 24 40.0 acres. Plots to Crawford co. of todays boundaries.
Sold Land-30Oct1860 to James H. West
Death-Arkansas 7Aug1867 at age 69.
Child Born-Arkansas 1868 Ada Ann.
I've documented this mainly fron census records, wills, probate papers, deeds and marriage documents. Very hard to buy film when you aren't sure where he was living in any particular census year as indexes aren't that accurate. If you have ever searched through microfilm you know what I mean.
If you wish keep in touch. I'm working this subject daily.