Mounting propane cylinder underneath

I'm a bit of noobie with building campers so be gentle
I am working on a design that is more TTT than teardrop for off road use. The design is going well and I'll share it soon for feedback.
One thing I have not been able to find a good answer on is the reasonableness of mounting the propane cylinder actually inside an outer access door in the body...as opposed to the tongue. The trailer has a space underneath that is closed off from the living area and mounting the bottle there would get it closer to the axle and help distribute the side to side weight better as well. I am concerned with safety though and realize the tongue mount is probably the safest. I would vent the compartment to the atmosphere but it is still under the bed. Do not want to be sleeping on a time bomb
Do larger campers mount their bottles underneath? I see several that claim to have propane but the bottle is hidden. Any thoughts?
Thanks
Paul

I am working on a design that is more TTT than teardrop for off road use. The design is going well and I'll share it soon for feedback.
One thing I have not been able to find a good answer on is the reasonableness of mounting the propane cylinder actually inside an outer access door in the body...as opposed to the tongue. The trailer has a space underneath that is closed off from the living area and mounting the bottle there would get it closer to the axle and help distribute the side to side weight better as well. I am concerned with safety though and realize the tongue mount is probably the safest. I would vent the compartment to the atmosphere but it is still under the bed. Do not want to be sleeping on a time bomb

Do larger campers mount their bottles underneath? I see several that claim to have propane but the bottle is hidden. Any thoughts?
Thanks
Paul