Non convex mesh collider with wheel colliders

Hi
I need create a vehicle pickup. I have a lowpoly model. To make vehicle driving I use a wheel colliders with rigidbody. But I should set rigidbody Convex parameter otherwise I get error “Non-convex MeshCollider with non-kinematic Rigidbody is no longer supported since Unity 5”.
After that I get incorrect vehicle mesh:

And I can’t use pickup truck bed to load cargo. Is any ways to fix this with saving wheel colliders?

Prefer to use primitive colliders. In its simplest form two box colliders would already sufficiently closely resemble the vehicles body for most game physics simulation purposes. Probably still less than ten for a sufficiently close outline shape.

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That’s about what I thought. Now I’m dividing the mash into separate simple parts