Some disadvantages of the gaucho/sofa bed arrangement are:
1) have to make up/down the bed every morning/night (gets old if you are out in it alot)
2) having to store the bed linens when not on the bed
3) having to pay for expensive upholstery on the gaucho/sofa - bed linens are usually cheaper
4) only one person can "nap" on a sofa
Otherwise...they're great and they do open up a small trailer.