A typically loaded 33' probably doesn't have more than about 3300# per wheel. The G tires are rated for 3750#. As Stripit suggested, get it weighed and make a decision from there.
As a point of reference my 36 has about 3500# on the driver's side and 3150# on the curb side lightly loaded for a short trip with all tanks empty.
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Leo and Janice
2007 MS 36 TK3 Glide Ride pin box
2012 GMC 3500HD D/A CC 4X4 DRW AirSafe Hitch
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