Replacement tires

The newer generation Maxxis M8008 tires have a "Q" speed rating. That translates to 99 MPH. I don't recommend towing your trailer at that speed.

The Q speed rating topic for Maxxis ST8008 has been going on since they hit the streets.
Here is a paste and copy email from..... forestriverforums.com
Old 07-12-2013, 06:49 AM
wmtire
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Here is a copy of the email I received yesterday from Maxxis, per my dealer request. (including original spelling)

Bobby,
The spped rating on for the Maxxis M8008 ST Radial is "Q", which is 99 MPH. However, according to the Tire and Rim Association the inflation pressures and load specifications in general for all ST Radial trailer tires, regardless of the manufacturer, are designed and rated at 65 MPH. If the speed is higher than 65 MPH, the pressure and load need to be adjusted according to the following guidelines:
From 66 to 75 MPH – the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) but requires no load adjustment.
From 76 to 85 MPH – the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) and load should be reduced by 10%.
We hope this information is helpful. Thanks for your email and interest in Maxxis Tires.
Best Regards,
The Maxxis Support Team.....
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Maxxis is still stuck with the old 65 mph speed rating per T&R specs for ST tires. IMO Maxxis will have to update their tires to keep up with all the new gen ST tires on the market with the higher speed ratings without all the caveats. It won't be 99 mph on a load carrying tire.

Provider ST tires were the first to come out with the higher speed rating ST tires on commercial trailers in the '11 era. Their OEM on certain rv trailer lines now.

Goodyear Endurance just came out last year.... are popular but no long term service record yet.

Carlisle HD became available in Sept 2016 release date .

Speed rating is more about the tire ability to cope with internal heat at speed while carrying a load.