The only warranty work done according to the previous owners was replaced microwave and a minor repair that I don't even remember what it was. Heartlands records said the same warranty work had been done. The build sheet shows washer/dryer prep with stackable washer/dryer.
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It's a 2014 and it was bought in 2015 so it could have set idle for 2 years but used for 3 months before we got it. I even had to replace the cheap plastic shelving rails in the pantry because 3 out of 4 shelves were falling because the plastic gave away. We didn't had a lot of heavy canned or jars of food stored either. I wondered how was the shelving supposed to hold up while traveling, we were stationary.
This is not a defense of Heartland workmanship. But some things to consider.
If the trailer is a 2014 model year, it very well could have been assembled in the early part of 2013, maybe even as early as March 2013.
So, if it is an early 2013, they bought it in the latter part of 2015 and you didn't buy it until a year after the original owners, you could very well have bought a trailer that sat for 3 or almost 4 years with almost no use.
As far as as your tanks go, you could add the sensor kit that uses SONAR using a tape strip on the outside of the tank.
If you search the marine catalogs you can buy a kit that could be installed in the top of the tank to alert when the tank is near full, about 3" below the top. I used the kit on our boat's black tank.
If you are filling the tanks to the vent line, you are stressing the system. Granted they should not leak, but you would not be the first person to have a leaking vent line.
My hints to tank level ? Although I do use the tank level monitor gauge, it is more for amusement purposes.
Black tank - when the toilet starts to burp, it is time to consider dumping the tank.
Grey #1, bath and shower - when the sink starts to fill and drain real slow, it is time to dump the tank. Or, the shower starts draining slow.
Grey #2, seldom an issue as I dump that tank when dumping the grey #1. But, same slow drain indicator.
When we use the washer-dryer combo I leave grey #1 open. Since the Splendide uses load size to determine water usage, you never know if the cycle is going to use 2 gallons or 7 gallons of water. And leaving it open for wash eliminates guessing how many loads were done.
As to the quality of parts used - all RV's use the same components for the most part. Doesn't matter if it is your Landmark or Bighorn or a $250,000 custom built New Horizons.