You've left out a lot of information. What is the loaded weight of the MH (full fuel, water, and ready for travel) as compared not only to the gross vehicle weight rating, but the gross combined weight rating? If the rig weighs 30k lbs on its own and has a 32k GCWR (numbers just used to illustrate), the strongest hitch in the world won't increase the tow capacity - you've got 2k left over.
The strength of the hitch is only one factor. The manufacturer, when setting a tow rating, must also consider the drivetrain. Besides the power of the engine, is the cooling system up to managing the heat from pulling the weight. Will the U-joints hold up, are the brakes big enough, will the trans hold up, on and on.
Changing only the hitch and its bracing will not give you a higher tow rating. Stay safe, get a rig with a higher rating, or trim the load. I may be the rig stopped ahead of you when your's, ah, won't.
Jay and Peggy Monroe
"Can't take it with you..."
2011 Winnebago Journey Express
2020 Jeep Wrangler Unlimited