Here is how I made an expanding bed for my motorhome/campervan. It is really solid and super functional with storage space underneath
Compact camper van kitchen
Campervan Interior, wooden finish.
Van to Basic Camper build - VW T4 Forum - VW T5 Forum
The Pod | Weekend Camper & Day Van | Cambee ™
VW T5 campervan conversion interior layout with swivel seats
Camper Kitchenette, Campervan Conversion Pod Unit , VW T4, T5, Renault Trafic, | eBay
Sportsmobile offers 50 camper van plans or will customize to meet your camping/travel needs, since 1961. Two (2) and four (4) wheel drives, gas and diesel vans. Just the right size. Second home/second car.
space saver rock & roll bed for campervan, Vauxhall vivaro, T4, T5,Vito,Transit in Vehicle Parts & Accessories, Motorhome Parts & Accessories, Campervan & Motorhome Parts | eBay
Camper, Campervan Conversion Pod Unit , VW T4, T5, Renault Trafic, Mercedes Vito | eBay