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
Make sure that on the server you have done something like rvm --default 1.9.2 to set RVM's Ruby to be the default. Otherwise, it will always use the default system Ruby.
rvm --default 1.9.2