I have an Autocruise Quartet, a PVC on the Boxer L3H2 (6m x 2.52m). The layout is perfect for us: PVC dimensions for driving & parking, 4 belted seats & 2 single bunks for when the GK's are with us, rear bathroom to hose them down at the beach. But even with pre-teens the bunk-bed headroom is becoming an issue. Plus the base vehicle is 2012, so emissions compliance (and general lack of driver aids) may become a problem. My thought is to transfer this into an L4H3 (6.4 x 2.76) base (or Crafter/Sprinter equivalent), potentially gaining space for a drop-down bed as well. What's the deal on regulation-compliant belted travel seats? Can the setup be moved from one vehicle to another, or will it need SVTA? Is the idea just plain dumb? Should I go to a custom-builder to produce what I want? Can any of them even do that? Or does anyone know if this layout already exists out there in our ridiculously fragmented marketplace? (Solaris XL is L4H2, so doesn't address the height issue, plus which the two separate travel seats look seriously uncomfortable... tell me if I'm wrong)