DW and I have a Jayco Octane 161 the electric bed support runners end just below the window, thus the bed does not come all the way to the floor. We have not taken delivery of the unit yet, and I am not sure how I am going to deal with that. I wonder if the rails that run the bed up and down could be replaced with longer ones.
Ours is a Happy Jack and the upper bed is a bed and we added a nice mattress pad to make it very comfortable for our older boy. You need a ladder for it. The bottom unit is a couch/queen bed and you can just sit on it with no problem. The only problem I have had with the bottom unit is the clearance. Our Polaris Ranger won't fit with it in so we pull the 4 pins and remove it, then using straps attach it to the lifting eyes on one side. We have plenty of clearance on the side for the bed and Ranger to fit inside. Just something else to think about.
Ours voltage has two beds on the HappiJack system. The bottom one gets low enough that you can sit on it with feet flat on the floor. We don't use the upper one and it came with the locking pins so it is up at the ceiling all the time.
Ours has two beds on the HappiJack system. The lower bed drop to about 2-2.5 feet off the ground. The upper bed drops to roughly 5 feet from the ground, you need the ladder to get on the upper.
It depends on the trailer brand. My Iconic trailer has a couch that folds into a queen bed that comes down to the floor and another queen bed above that you need a ladder to get into. My buddy has a trailer with one queen bed in the back that you need a ladder to access. I have seen other trailers that have a single bed that comes all the way to the floor. I didn't want to sleep in the back so I purchased a trailer with a walk around queen in the front for the wife and I and the grandkids can sleep on the 2 beds in the back.