My wife and I have had our Skylark 21 FKV for over two years now and love it. We had one warranty issue, the heat pump failed after about 6 months of use, but was covered under warranty. The new heat pump has worked very well even in colder temps. We did learn when the original heat pump failed during an early spring trip when the outside temp hit 32 that a 1000 watt electric space heater will keep the camper at 70 degrees without any problem. (Note: 1000 watts at 120 volts is only an 8.5 amp draw on your electric circuits.)
I discovered that on our 21FKV that under the seat next to the main bed there is a large amount of space behind the wheel well, that can easily be accessed through the plywood cover. By removing the two screws that hold the plywood in place, cutting the plywood in half, and adding a piano hinge and putting in a finger hole you can gain more than 6 cubic feet of storage space simply by lifting the seat cushion. I also placed a 1/4" plywood partition on the front of this space to keep gear from moving forward over the wheel well. We use it to store our portable vacuum, extra dog food and an electric space heater we had to purchase on the trip where the heat pump failed. (Note: a 1,00 Watt electric heater will keep the Skylark at a comfortable 70 degree temp even when the outside temp drops below 25 degrees.)
I also added a push button LED light in the storage compartment under the main bed so you can find things in the dark. I used one of the four spare circuits in the fuse panel for power.
To counteract the wear on the skids at the back due to the low ground clearance, I added short pieces of 2 x 2 angle iron to the skids with a single 1/4" bolt. Now if I drag the back, I can replace the sacrificial pieces for less than $2 a set instead of replacing the skids themselves.
Enjoy your camper.