There check those out for DIY stoves made out of propane tanks.
Back to your 3 burners/oven combo, that's what I have in the house, been cooking with that for 15 years now. Haven't installed my old gas range,very heavy need to reinforce the floors first. But the propane RV works just fine altough I had to add a thick steel plate in the oven, much better heat distribution=less burning of the pizzas.
Also mine doesn't have much insulation on the bottom, will get hot enough to burn whatever it is mounted on, same with the sides so watch out when re-installing, leave lots of vented air space around it.
Careful with them bloody stoves, there is a very crispy one on the scrap pile at the local dump right now, second "crispy" one I see there.