What they said … the first one was much better. Don’t overdo it on the textures. The cracks aren’t needed if you make the dirty spots convincing. Don’t just place the dirt randomly. Think about why it would be there (i.e. greasy hands opening the door, mud kicked up from tire, water damage around windows).
I really liked the color and simplicity of the first one. All that was needed was a little wear and tear on the chrome pieces so that they don’t look like they were just installed.
Change the roof vent so that it opens to the rear of the trailer. I like the clothespin on the roof … nice touch. Rear lights are perfect! Just as I envisioned them (minus the shiney chrome - already mentioned). The side cones that they attach to should be the same color as the trailor with a chrome trim piece attached (see concepts again).
The frame that the trailor rests on should be metal - not wood. If it were wood, this trailor would be on the ground rotting and without a floor. That’s a little severe for this poor white trash Mom. 
A little more detail is needed in the wheel rims. The tires are fine, but the rims look like a concave surface with a texture applied. Look carefully at the contours of the rim.