save up your money and get a 17 inch package, your truck will ride so much better. i was looking at tires in 20's and they were around 1200, i got wheels and tires in 17 inch for 1600, and sold mine old ones for 400.

 

yes 20 in tires are crazy expensive , thats the only bad thing ,

 

Terra Grapps are a good tire, I have them on my Grand Cherokee. Very good tire everywhere but in deep mud (which is why they are NOT on my truck, LOL). Way above average on wet pavement and a very quiet tire.

I have only had mine for about 9k miles, but I have a buddy with a set who has over 60k on them.

I agree with dave-o, get 17" wheels and tires. May cost you a little more now to get both, but you'll save a bundle on every future tire purchase PLUS 17s give a better ride (more sidewall), have higher tow capacity and are MUCH better off road...