Mayton 10-Inch Pocketed Coil Rolled Medium Plush Mattress With Cover for Adjustable Bed, Split Queen (30x80 each half)

What is the true size of this mattress? One place says 30"x80", another place says 30"x75"?

Does this really only weigh 20 pounds???

What IS the size of this? It says 30 x 80 in the header but 30 x 75 in the description by the picture and then, again, 30 x 80 in the lower descriptio

Will this mattress work for an RV bed?