Stabilizers are on my to-do list for the winter. Wife complains that I "really rock the boat" when I get up and make coffee 3 hours before she's ready to be up and moving.
I pondered and voted No on roughly the same list you have, Nate. Oh, I do have the hard start capacitor in my toolbox, waiting for installation ... for 2 seasons now!
Probably going to dive into the belly this winter as well for some cleanup and insulation.
edit
forgot - added flagpole on rear ladder. Paid way too much (Camping World - need I say more?) but wanted one before 4th of July. Was pondering building a mount that bolted to a couple empty holes on the hitch but never got past the planning stages
adding or thinking about ...
Fishing pole holders in forward compartment
Rifle cabinet in forward closet ... yeah, well ... maybe
Coat hooks in back corner of living room
key hangar board on kitchen wall next to exit door
weather station with indoor/outdoor thermometer
Upgrade thermostat
would love to vent the range hood fan outboard but I am probably NOT going to cut a hole in the side of momma's 5er...
Suspension upgrade during this winter's bearing repack/brake check
extra propane QD for BBQ
slide out floors in forward storage compartment
heavier gauge wire from WFCO to batteries
another 12V outlet in bedroom (for CPAP)