hows everyone doing? got a questions. i just bought my 05 ford f150, i am very happy with it except the tires the owner before put on the truck. they are toyo open country (325 65 r18s). i get stuck in wet grass pretty much. and they are very very close to rubbing. i am thinking of switching the tires out with more aggressive tires but dont want to break the bank. what is a good tire, that will be a little smaller in width and get good wear?

also is it normal when i put it into 4 wheel hi/low and it make a clunking sound?