Use 3-4 ton floor jack and 6-ton jack stands for E-350 Class C. Lift at frame rails, never on engine components. Always use jack stands - never work on jack alone. Block opposite wheels on level ground.
Yes, you can achieve significant improvements for around $15K with incremental upgrades rather than the full $30K air ride conversion. Focus on the highest-impact modifications first for your F53 chassis.
Most RV water heater drain plugs are designed to seal without thread tape, using a tapered design or built-in gasket. However, checking your specific model's installation instructions is recommended before proceeding.