Im not sure about RV's but for me and all of my auto's/Jeep I usually go with the 50K mile mark for Tranny + rear end fluid.
That 97,500 / 150,000 miles just sound too long to me - esp if your towing.
But perhaps these RV's are Heavy Duty enough they can go that long.
What does the color of the Tranny fluid look like? If it looks like new I would keep going till 50K.
The rear end should be fine for at least 50K IMO. Unless you go though 3+ foot water - that could suck in water. But my jeep not the RV.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.