Off road tires on a Crown Victoria?

I have a 2011 Crown Victoria P71. I've always wanted to put some off road tires on my car but didn't want to buy the wrong tires and rims for my car. I was looking at buying some 17" rims for Ford (from what I've seen those are the right size rims) and I wanted to get some off road tires on it. The main questions I have are would off road tires actually fit on my Crown Vic p71 and are there any meaty/Off road tires that would just fit on my regular rims?

Your 2011 Crown Victoria P71 requires 235/55R17 sized tires. There are zero off-road or all-terrain tires available in that size. The closest you could get would be a light truck tire in either the highway all-season or crossover/SUV category.

http://ucelinks.cdlib.org:8888/sfx_local?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&genre=article&sid=ProQ:ProQ:socabs&atitle=IDEAS+AND+MOVEMENTS+IN+19TH+CENTURY+RUSSIA&title=Revista+Internacional+de+Sociologia&issn=00349712&date=1968-01-01&volume=26&issue=101-102&spage=19&au=FOYACA+DE+LA+CONCHA,+MANUEL&isbn=&jtitle=Revista+Internacional+de+Sociologia&btitle=&rft_id=info:eric/70E1946&rft_id=info:doi/

If you got some 16 inch wheels (assuming they clear the brakes) you could go with some 235/60/R16 Yokohama Geolander A/T G015's. Overall diameter vs. The stock size tires is virtually the same ( 1/10 of an inch difference)