Considering the weight of the 23 trailer, the 15" Michelin LTX (P) 235/75R15 XL tires would carry the weight quite safely. I used them on my 2013 25FB International Serenity with a GVGW of 7,300 pounds. My 15" Michelins had a 2,183 pound load rating on the sidewall. Using the derated capacity for trailer use, four 15" Michelins were rated for (4 x 1985 = 7,940 pounds) on my 25FB.
Under my avatar is the link to images. You can see a takeoff 15" Goodyear Marathon still mounted on a factory 15" aluminum wheel next to the tire captioned above also mounted on a factory 15" aluminum wheel during my tire swap process.
15" Goodyear Marathon diameter is 28.3"
15" Michelin LTX (P) 235/75R15 XL diameter is 28.9"
16" Michelin LT 225/75R16E LTX M/S2 diameter is 29.2"
You might consider the 15" tire size and acquire a set of "used" Airstream aluminum wheels from someone like myself with a Classic 30 (GVW of 10,000 pounds) coming in at the end of January and switching to 16" Michelins to carry the heavier trailer and will have a set of four Aluminum and one steel wheel with just the mileage incurred coming from Jackson Center to the local dealership in Mesa, AZ.
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WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic w/ twin beds, 50 amp service, 1000 watt solar system, Centramatics, Tuson TPMS, 12" disc brakes, 16" tires & wheels
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