Bed overhang supports.

In designing my tent on a trailer I will have 1 foot of the bed inside the trailer and 2.75 feet a flap going outside the trailer. There will only be a 3 foot mattress. The other 9 inches is space to the dome tent wall.
What is a good light method of supporting this overhang?
Emt or aluminum tube bent in an upside down u shape?
Should it go to the ground or back to the trailer. I would put this support about 2 feet out from the trailer.
Thanks for any help.
What is a good light method of supporting this overhang?
Emt or aluminum tube bent in an upside down u shape?
Should it go to the ground or back to the trailer. I would put this support about 2 feet out from the trailer.
Thanks for any help.