I've used one my 98ZJ and they are very strong. They are also great for maneuvering trailers in tight spots. I have one also for my 07 WK but haven't gotten around to installing it yet. I'd be careful of pushing snow with it though because if you hit something that force gets transferred right to the unibody.
2007 WK Limited Hemi QDII
1998 ZJ Laredo 4.0 Selectrac