My mods were done when the trailer was new. I didn't think I had much done but the list was longer than I first remember. Not anything major but just a lot of little jobs. Here's my list:
Upgraded bathroom fan to a Fantastic Fan.
Added a window awning to the bedroom window.
A lower cabinet door flipped to open in the other direction. That's where I tucked a small kitchen trashcan and now I have easy access.
Added lifts to overhead cabinets. No more using my head to keep the door open while I reach in the back for something.
Upgraded battery and had a second battery added. Also had a battery disconnect installed when the unit was new.
Outside storage compartments locks were switched out after someone stole my stuff while parked at storage place.
Switched out while exterior plastic pieces for black color.
Had Perma Plate protection added (exterior & interior). It's a spray on protection at the dealership.