Adding Sleeping capacity to a 2720SL

Hello- just joined forum today since I am considering buying a Trailmanor. Looking at the 2720 2 bedroom and the 2720SL-
I cannot make up my mind- need the added sleeping capacity in the 2 bedroom because my son, his wife and grandson sometimes come along but like the sofa in the SL to watch tv comfortably when it is just my husband and I. Does anyone have an SL and need to increase sleeping capacity? If so, what have you done? Inflatable bed, foam futon, etc.
Thanks in advance for any input.