Is pinning opposing robots trailers allowed?

[spiffyspleen]

Our team was thinking of building a robot that would pin other robot's trailers to the wall close to our alliances throwers so that way they could easily throw the rocks and cells into the trailer. We would do this by having an indent on the front of our robot the shape and size of half of the trailer. This indent would have bumpers all around it, so it would just be bumper to bumper contact. the indent would just fit inside the 38in. width requirement. I can't find any rules that would prevent this.