Slept in the mp for the 1st time, one night only, last weekend. Only had it 2 days, so not up to speed on everything. Can any member tell me if the bottom bed is designed to go completely flat. We had a 2inch drop down to the rear parcel shelf, is this normal? Realise we are going to need a topper, but all the pictures I’ve seen, with a topper on the beds, seem to depict the bed extremely flat. So, is this achievable? Thanks for any help!