For some time I have been using a new walking floor model in my personal Stobart mod.

The model is a Bodex walking floor created by TZ Express. I am still debating which version to use in the BSM.

Here are the pros/cons.

The current biomass trailers use the SCS Cool-liner model.

Pros:
I really like the look of the trailer.
It’s easier to paint and keep up to date.
Everything works as it should because it is a default model.

Cons: 
It has a fridge on the front.
You can only paint one side and the other is mirrored.
The new model I am playing with is the TZ Express – Bodex trailer.

Pros:
It’s possible to paint both sides independently.
It has stairs rather than a fridge unit.

Cons:
Parts of the UVMap are put together badly. The white bars on the left hand side (lower pic) are coloured by parts of the trailer on the back doors. Making accurate skinning impossible.
The real Stobart Walking Floors are not Bodex.
The real Stobart WFs do not have those side opening doors.
The model does not have a proper lod so the wheels disappear from parked AI trailers.
Personally I am leaning towards keeping the original trailers because they are simply easier to work with and have less cons, although they have fridge at the front, it’s not something you really notice while playing.