Just looking at the example, wouldn't you need to install the hitch and then pin it to the receiver inside the cover or are you thinking of sliding the cover onto the hitch tube, installing and pinning the hitch and then pushing the cover forward into place?
If installing the hitch with the cover in place, there does not appear to be sufficient space to install the pin unless the bottom of the cover is wide open allowing access to the pin from below, which is not visible from the picture.
Also, the trailer electrical connector example shows an opening with a bushing that is large enough to pass the cable through but not the connector itself, unless possibly a 4 pin. The opening would need to be large enough to pass the connector itself through the cover, or possibly a slot cut from the bottom of the cover up to the cable hole in order to pass the cable up to the hole with the connector already on the vehicle side of the cover. This method would also require a split circular grommet to allow the cable to enter the grommet, protecting the cable from chafing on the cover edges.
I use the WeatherTech bump step on both my Expys when not towing. It hides most of the ugliness of the trailer connections while protecting the bumper cover from idiots behind me and in parking lots not paying attention to driving.
In any case, I would love to see how the finished product turns out.
