18 In RIM vs 20IN RIM for Towing
05-27-2015, 10:04 AM
#11
If the tire has a tall blocky tread it will squirm until they wear down some. The condition is known as tread squirm and is common with aggressive tread patterns. It may be barely noticeable empty but will become obvious when towing heavy. Several years ago I put the most aggressive tires (dual) on the back of my f450 tow truck I could get to improve its mud capability. The truck became almost unmanageable with a big load on the lift. It IS a tire issue.
they are the OEM tires the op said
05-28-2015, 10:10 AM
#12
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If the tire has a tall blocky tread it will squirm until they wear down some. The condition is known as tread squirm and is common with aggressive tread patterns. It may be barely noticeable empty but will become obvious when towing heavy. Several years ago I put the most aggressive tires (dual) on the back of my f450 tow truck I could get to improve its mud capability. The truck became almost unmanageable with a big load on the lift. It IS a tire issue.
05-29-2015, 09:10 AM
#13
Senior Member
My stepbrother went through the same thing with his Suburban a couple years ago. He put a new set of fairly aggressive tires on it but didn't notice anything until he towed his boat a few weeks later.
05-29-2015, 07:13 PM
#14
These tires should work but maybe not the rims. I would start by looking for broken belts (bulges) in the tire and than move on to the rim. Specifically, check to see if the rim is seating fully against the hub. Look to see if the hole in the new rim matches the hub on the truck. If the hub on the truck is too small than the rim will sit flat but will wiggle when loaded as the lugs are not really meant to support the rim, just hold it to the hub. If the hub on the truck is too big than the rim will not sit flat on the hub and it will wobble.
05-30-2015, 06:32 PM
#16
Typically the 20" tire will have a shorter side wall than the 18" so ride quality should be better w/the 18". What you really have to pay attention to is the load rating of the tire and make sure your tires can handle the weight of your towing needs.