SMB.
Most riders use XR type dirtbikes and convert them to street use. These are not designed to be ridden two up. The bikes you buy from your dealer as dual sports are actually enduro type bikes and are more designed for street than dirt and most have passenger pegs.
Dirtbikes can be ridden double, but, like said, you have to ride right up on the gas tank and your passenger has to ride close to you to balance the bike out.
I've done a lot of riding with my wife on the back, I don't know if I would try it with someone like,,,,,say,,,,aaaaahhh, GOMER:scream: But, it can be done. You would have to ask Okie or Thump or one of those other guys about that.
Just my $ .02