We have a 2015 Mammoth and really like it. The major selling points for the Mammoth were 1) the number of windows and natural light inside, awesome. 2) the double access to the bed, I don't have to crawl over my wife to get out of bed. 3) the open space floor plan and bath. We were able to compare side by side with an Eagle cap TS and in my mind no comparison due to the fewer windows and reduced floor space.
I took it to the factory at Bend to get some bugs fixed since Bend is closer than the dealer in Monroe WA. Dave was nice and offered to fix anything that was wrong. They fixed what they could, some blemishes with the interior finish would require major diss-assembly and were a no go. Dave also said to bring it back anytime anything goes wrong and he will take care of us.
I have taken care of some annoyances (to me) that have really improved the camper.
1) Replaced the silly sewer hose tube with a slide out tray that will hold my sewer hose with fittings and the cone adapter.
2) added small gas struts to the overhead door above the TV so it will stay open when needed. Did the same to the cover over the generator compartment as you have to get in for the remote jack activation and the outside shower.
3) added restraint cables to the basement door so when you open the door it does not bang on the ground.
4) installed a GM factory rear-view camera on the basement door and connected it through the umbilical power cord to the factory GM in-dash scree.
5) connected the bedroom and living room tv sound out put to the sound system so that if receiving broadcast TV signal on either unit the sound would be controlled and distributed through the built in speaker system.
This is my first post here. I will add some picture of these mods if anyone is interested.