Rib bed 150 LWB installation

[Jeffsmith]

Hi, I've been converting my LWB transporter over the past few months.
I've decided to go for the full width 150cm rib bed and I'm doing o install it myself. It's the none gliding version and wanted to know if anyone could help with the position of the bed when fixing to the chassis rail.

It looks like theres 2 rails to fix the u shaped steel (from the official fixing kit) to but the closest rail to the tailgate under the van pushes my seat to far back not allowing the bed to open out flat.
The rail that the spare wheel bracket pretty much sits on pushes the seat to far forward. I can't get in contact with the supplier as it's closed so wanted to see if anyone had tried this already and had the same issue. The perfect location would be almost central between the two.

Thanks in advance to replies

 

[WoodthorpeT6]

When I looked into DIYing my own van, I spoke to a RIB supplier campervanbeds, they said can install the RIB u section between the reinforcement beams.
The RIB u shaped steel can go over the vans reinforcement beams but it doesn't have to. This allows for multiple configurations.