I can't speak to the F53 chassis but I am sure others will chime in who have it.
I installed Hellwig heavy duty sway bars, a Roadmaster steering stabilizer and front and rear Sumo Springs on my last coach (2018 Ourlaw 29H on the E-450). It made the handling and comfort improve dramatically. I did the work myself and it cost about $1500 in parts.
The stock E-series chassis suspension has a hard time handling the length, height and weight of a Class C over 25 feet.
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