my friend has swamplites on his rancher and he rides on roads and they are already wearing. he proubly had them for 8 months. every one is worried about weight of tires so the companys are making lighter rubber compounds and that is why so many tires are wearing bad. i started on 589's when i started mudding and they wore good and they also did good on trails, they are not too light but maby you could look into them. there is a tire called executioners that also wear good but they weigh close to 30# is 27". hope this helps some.
-Aaron