Late reply to your situation -
I have a 2017 Passport 23RB. Bent the trailing axle and broke both hangers while driving the baaad Mass Pike.
Replaced the Dexter 4400# with Dexter 5200#. New hangers, wet bolts, along with the new axles, hubs, and bearings. Down in FL right now. Made the 800mile trip with no issues. Everything looks good underneath. Brand new Carlisle HD Trail E rated tires too. (Had Goodyear Endurance before and don't think they wore very well. Could have been the axles....)
Very reputable trailer shop (Northside Trailer, Zionsville, IN) felt like "all the RV bumper pulls and 5th wheels are marginal" with regards to the specs on the OE axles. According to the Dexter specs the 4400# axle should be enough for the 23RB trailer I had.
I don't see any reason not to use the heavier axle if available.
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2015 Ram 1500 Laramie 4x4 5.7 Hemi
2017 Passport Elite 23 RB
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