Thank you for all your suggestions

In an attempt to save as much space as possible, I wondered what other people have found invaluable with regards to space saving in your Bongo.so what is your gadget or space saving tip?

I have been looking at getting a memory foam mattress for the roof, have you bought one yet? If so what is it like? Is it any good

Thank you simon jones and wonkanoby!
I have finally managed to fix it after repeated thumping and nearly breaking my hand...I finally decided that thumping and swearing was not going to work!
So I took the plunge and took the side off, tapped the metal bit that is above the cog and it all flicked ...

Can anybody help me solve this problem? I opened and closed the side sliding door before I realised that I had a flat battery, when I tried to open again it wouldn't open!
Please can anybody help?