Yes it will. Put the boxspring in first.
No. Two twin size mattress will fit a king size bed frame.
Mattress sizes are notoriously confusing, but in general, a "double" is significantly wider (as in, over a foot wider) than a twin and will not fit on a twin frame.
yes they will fit in witdth, but not in length
When you say mattress that is the top. Boxspring is the bottom. So im guessing you have mattress and boxspring extra long. The answer is yes. A twin extra long mattress will fit a regular twin bed frame. The length is just longer not the width.
no.
No
Yes you can cut a king mattress pad to fit a twin, just make sure to measure carefully.
A standard twin mattress will fit into an xterra. You must fold down the seats and adjust the front seats a few inches forward but I managed to fit an entire bed in there.
No, they will not fit.
'Deep pocket' refers to the thickness of the mattress (eg, 9 inches, 12 inches, etc). 'XL-twin' refers to the twin mattress being extra long, not extra large. These are two different dimensions of sizing, and both must match the manufacturers description of what size mattress you own in order for the sheet to fit properly.
No, a twin size mattress cannot fit on a king size box spring. A standard twin mattress measures 38 inches by 75 inches, while a king size box spring is typically 76 inches by 80 inches. The dimensions of a king size box spring are much larger than those of a twin mattress, leaving the mattress unable to sit properly on the box spring.
No. Two twin size mattress will fit a king size bed frame.