We have an older, 2004, 5210 with the jack knife beds. It is spec'd in the brochure as a 4 person RV with two beds.
You can put both beds down and sleep cross ways but may find the gap in between the two beds to be bothersome. I'm 73 inches and sleep ok a little diagonally.
The only options I've seen for the 5210 are two jack knife beds or one jack knife and one banquet that makes down to a bed.
But then, I'm talking about 2004.
Rio Rico, AZ
2004 BT Cruiser 5210