That'll be too late. The Texas borders will be closed by then. Best hurry while you can still get in.
They will never close their borders to people who are willing to help
From the TEXAS Declaration of Independence from Mexico..
http://avalon.law.yale.edu/19th_century/texdec.asp
It has demanded us to deliver up our arms, which are essential to our defence, the rightful property of freemen, and formidable only to tyrannical governments.
THE RIGHTFUL PROPERTY OF FREEMEN! Even Texas understood it!