If I am correct you are talking about a Motorhome, not a trailer. The rear wheel bearings are taken care of by the rear axle gear oil, no greasing involved there. The front wheel bearings should be good for a lot more than 16,000 miles, but refer to the specifications for the manufacturer of the chassis. I presume Mercedes?
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2020 Eagle HT 30.5 CKTS Modern Farmhouse (16" wheels, spring shackles set on lower hole of frame, SumoSprings TSS-107-40, standard kingpin, B&W Companion slider, TST-507 TPMS, Progressive Industries hardwired 50A EMS HW-50C)
2019 F250 SRW SuperCab 4X4 SB 6.2 (10,000# GVW) 3.73 Axle 18" wheels
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