Correct size

[EvaC]

What is the correct size mattress for a king size short? I just do not know why I’m coming up with so many different measurements?

[RobWNY]

B.O. Plenty wrote:
The sizes may vary. My trailer has what they called a king size bed. No mention of anything special. I measured it then bought a standar king to replace it. I had to add 2 inches to each side of my frame but the length was the same. If you buy one of the popular foam matresses in a box, you can remove the cloth cover and cut it to any size you want with an electric knife. then reinstall the cloth cover. Much cheaper than ordering a special size.
B.O.

the "Standard" RV King is really an Olympic Queen. I did just the opposite of B.O. I cut a couple inches off each side of the plywood base and put in a standard Queen bed. I now have an extra couple of inches on each side of the bed to move around.

[cpaulsen]

Can you just measure your base where the mattress sets and order accordingly?

[B_O__Plenty]

The sizes may vary. My trailer has what they called a king size bed. No mention of anything special. I measured it then bought a standar king to replace it. I had to add 2 inches to each side of my frame but the length was the same. If you buy one of the popular foam matresses in a box, you can remove the cloth cover and cut it to any size you want with an electric knife. then reinstall the cloth cover. Much cheaper than ordering a special size.
B.O.

[agesilaus]

Try This link

Seems like a lot of variation, I suggest you measure your bed not the mattress

[Lwiddis]

Your measurements are? IMO bed measurements vary slightly among manufacturers.