Google Suburban (or Atwood) RV Cooktops. Both, and probably others, make two-burner stove models. You would have to do a bit of fabricating to make a mount. They should use low pressure (regulated) gas.
Happy Camping! ///// Richard D.
2006 4x4 Ford 250 SD / 2007 Flagstaff 827 FLS
One very patient wife and one furry child who travels with us. Forty-two years of trailering and camping, and I still have a blast.