Single beds or fixed island?

Hi everyone, a long time since I have posted but I hope I have the right place! We have sold our motorhome and now planning to buy a caravan, we will be going to the caravan show in October . We prefer beds which give us both easy access so we don't need to climb over each other when getting out of bed. We are considering singles or fixed island .Are caravan single beds big enough for adults or should we limit our search to a fixed island bed? We are average sized adults but not quite as agile now. Looking forward to hearing about your own experiences and thoughts. Thank you