Best Additions / Modifications, What Did You Do ?

In no real order.
Bilsteins

Oxygenics

Vortex Fan for bathroom.

Swivel Seats

New Window In Door

Valve stem kit

Led lights For entire RV.

Converter To replace the ****py WFCO and get a great 3 Stage one.

New Toilet To replace the old unsanitary hand flush with a foot flush.

Digital Thermostat To keep things cool or toasty easily.

Awning lock

MaxxAir Vent Covers

Fantastic Fan

Just to name a few