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Old 01-14-2016, 12:49 PM   #31
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Location: SE Iowa
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jsut to talk of the 20" tires my duramax has them at 60,000 when it was time to replace the stock tires and a wanted something a little more aggressive and there was not a lot of choices in an e rated tire Goodyear makes two different wrangler series cooper has one and then nitto had one i went with the cooper as i have had good luck in the past

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Old 01-14-2016, 06:31 PM   #32
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Big tire issues!!

Originally Posted by pryner View Post
We're considering a new Ram 2500 mega cab 4wd to tow our 5th wheel. All of the ones on the lot have 20" rims and tires rather than the original 18"s. We had to adjust the hitch on our current 2009 Ram 4wd as the camper came into contact with the top of the bed so I am concerned with the 20" tire setup. Has anyone had any experience with the mega 4wd cab? It is a concern or am I worried for nothing?
I do not know about a "new" ram truck, but i do know there have been a number of issues with rams and fords with the 20 and 22 inch wheels and TOWING as most if not all these big wheels are not rated to tow with!!
I have read about rams with 20 being "lowered" to more than half the regular weight because of the rims.

So first and foremost you need to check you towing capacities on the truck with the 20's before you even worry about the bed clearance.

Now if the weight comes in good yes you will most likely have issues with these big wheels as it does raise the truck up, so you will need to see if you really want the truck and it can tow what you want (always try and think future needs) how can you raise up your trailer, you can flip axles, use lighting blocks have new springs made.

This has been a very large and growing issue with all the big three as they have changed their bed heights and they will hit, many people have done a large number of things to fix the issue, just do a internet search and you will find out you are not alone.

Hope this helps some and in the end Happy camping

2010 Cedar Creek Silverback 35ts
2001 GMC 2500HD w/ Allison & 8.1
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Old 01-16-2016, 10:34 AM   #33
Join Date: Mar 2015
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I have a 2104 Ram CTD 2500 CC 4X4. I wanted the 20 inch wheels as I had seen both side by side and that was my choice. I have seen nothing that limits towing capacity by wheel size, payload may or may not be affected. I suspect the bed height is the same with either 18 or 20 inch rim. My spare is 18 inch, so that tells me outer diameter is the same as my 20 inch tires. The 18 inch tire will have a bigger sidewall compared to the 20. Some say they ride better, I imagine it would be hard to tell with one inch more of sidewall. Probably more options for replacement tires as stated. Do some research on the diesel truck forums, plenty of posts there about 18 vs 20.
2014 Ram 2500 Bighorn CC SB CTD 4X4
2016 Flagstaff 8528IKWS Platinum
2013 Keystone Hideout 23RBWE -Sold
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Old 01-16-2016, 11:29 AM   #34
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Location: Oregon
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20" not being able to tow as much as 18" is wrong. Got to Fords website and then check out the ratings for tires on any tire site.
20" tires are rated as high or higher for load as 18".
As an example Ram uses 285/60/20 and 275/70/18. Fords the same probably.
the 20" is 33.4" high and the 18" is 33.2" high. Both have 3640lbs load rating @80psi.

Biggest issue is replacement cost. Depends on what tire but Tire rack has Michelin Defenders LTX M/S 18" for $219 and 20" for $282. For the price of 3 20" you get 4 18". The cost of bling I guess.
The old school thought that 20" are inferior is, well, old school. The 20" tires on trucks are not the same as the 20" stuff on some kids Honda Civic.

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