does anyone have the 21' mattress dimensions handy?

[yxan]

I am about to order a custom mattress topper for mine and wanted to see if anyone has the measurements, Trailer is not close by for me to quickly get this information.

I know its 54x80 but need to know how big the corner cut is by feet

Cheers

[John in Santa Cruz]

our bed is all made up as we're leaving on a road trip in the AM, but near as I can tell, the right side of the mattress is 70", and the bottom end is 44", so the missing corner is about 10 x 10 " ...

[War Eagle]

Do as you wish, but we simply purchased a quality off-the-shelf memory foam mattress topper for a queen-sized bed (to get the full 80" length) then used a pair of kitchen shears to cut it to fit. Not just the width and angled lower corner but also the slightly rounded outside upper corner that needs to be trimmed a bit to fit into the rounded corner of the camper shell. Also, others may want to chime in on this, but I believe, beginning nearly simultaneously with the new generation models, the mattress was manufactured 1" smaller in both horizontal dimensions (53" x 79"?) so as to leave a little breathing room between mattress and walls.

[Rossue]

An electric carving knife works great for trimming foam.

[2yax2go]

Our mattress measures 52 x 78. The corner clip is 12x12. The clip on the bed box below is 11x11. The thing we did differently was to clip both the lower right and the upper left corner of the mattress. This way we can rotate and also flip the mattress as needed. We have not had any problems with having the two clips. This way my wife and I both get our own clip.