I need to ensure I have mod_rewrite enabled.

We get this question quite a bit, but not too sure why.  It's always enabled in Apache by default.
To confirm, type:

/usr/sbin/httpd -l | grep mod_rewrite

and you should see

 mod_rewrite.c

in the output if it's enabled.

If not, then it's possibly you're not using one of our compiled binaries, in which case, recompile apache and php:

/usr/local/directadmin/custombuild
./build all d
./build rewrite_confs

and confirm the "Server built" date is current:

/usr/sbin/httpd -V