We are traveling from Los Angeles to New Orleans on the Sunset Limited. We are seniors and one is handicap and can not climb up to the top bump. Is the bottom bed large enough for two average size people to sleep there. Do they have rubber mattress that you can place on the floor? Don't have have bedrails to keep someone from falling off the top bunk bed. My husband is a rough sleeper, and he tossest and turns during the night.