Difficulty importing models into gzweb

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We run a custom roslaunch that starts up gazebo with some custom models that appear to all be .gazebo and .xacro files. These models utilize ros modules for laser vision and vehicle control.

I can't seem to figure out how to get these models functioning in gzweb. I've tried adding the path to the gazebo/xacro files as a gazebo_model_path. I've tried converting the xacro to sdf, writing my own .config, and adding it to gzweb assets folder. If I do this, however, when I run the thumbnail generator is complains that rosinit has to be run (I'm guessing that's related to the modules used in the model).

Please help.