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At one time Prevost had a means to upgrade a 10,000 pound hitch to 20,000 (1,500 tongue weight)
If it is not a Prevost designed upgrade do yourself a favor and get a coach specifically designed for the weight you want to tow.
Over the years a lot of Prevost coaches have had structural failure (hidden) because the owners did not comply with the limits which going by memory were the stated hitch weight limit at about 8″ out from the bumper. The typical issue was the CG of the hitch weight was often further out, such as on a motorcycle carrier with the CG as much as 24″ out and a bike weight of 500 lbs, making the limit exceeded by 50% or more.
The Prevost structure that typically experiences broken welds is that which extends downward, sandwiched between the outer skin and the coach interior. First evidence of that will be cracks across the bottom of the rear cap or cracks around the rear cap rivets. The ultimate outcome is the probability the engine cradle will fail.
Prevost will NEVER EVER repair that type of structural failure because they want to stay away from the liability and rightfully so. A Prevost is a bus, was designed for use as a bus and was never designed to be used to pull a trailer.
Clint & Tammy Summers
2000 XL 45 Country Coach (rivets)
1977 FC31 Bluebird Wanderlodge (more rivets)
Vonore TN