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Each TT/RV "need for improvements" is different.
For my 2006 Jayco TT:
- Installed Extra 12V computer large size fan behind fridge to keep it cooler during extreme hot days. Great upgrade.
- Re-routed its PEX piping to allow easy bi-pass (for winterization tasks).
- Installed RV Surge Protection. Better than factory.
- Installed better / quieter fan in bathroom. Better than factory.
- Installed large access hole (with removable panel) to view rear of hot water tank (for yearly inspections). This large access hole (and removable panel) should be factory build.
- Installed 12V manual battery switch on trailer tongue. Better than factory.
- Upgraded to STAR brake wiring using thicker 10 gauge wiring instead of default linear brake wiring. Better than factory.
- Removed 11 of its windows, removed its inner lip foam (that always leaks in time) and re-sealed each winter - the proper "old school" way. Better than factory.
- Installed Roof vent covers (black over bedroom area and white over bathroom).
- Tinted windows on the kid's bedroom - to allow them to sleep in longer.
- Installed longer master bed base to allow longer normal house queen mattress (instead of factory RV short queen bed).
- Installed 12V safety lighting on its stairs. IMO, this should be minimum factory.
- Installed galvanized wire mesh around Hot Water tank. Thus, stopping "stuff" within same storage compartment from hitting / laying against the rear of HW tank, and eliminate the risk of fire. This should be factory build.
- Installed 12V light within TV cavity cabinet area. Now, we can see the TV's control buttons without turning on a ceiling light.
- Installed 110/120 Volt meter (bought from ebay) to view available volts (to decide to turn AC unit ON or OFF).
- Installed 12V fan (with manual switch) on roof vent to "suck" the bad smell out of the black tank. No more stank smells within our small bathroom. And, no need for chemicals either. IMO, this should be minimum factory build.
These are just a few mods to my Jayco.