RVM is not working over SSH.
At the command-line:
leifg@host:~$ which ruby /usr/local/rvm/rubies/ruby-1.9.2-p290/bin/ruby
Connected
I've just added at the top of ~/.bashrc (for git user) this string:
[[ -s "/usr/local/rvm/scripts/rvm" ]] && source "/usr/local/rvm/scripts/rvm"