New to the site and we are in the process of purchasing a 2012 29MK. I've read numerous articles and some other forum posts re the Greystone. So the questions are: Have frequent are the problems with sagging holding tanks and poor filling of fresh water tank? Are there problems with the axels like those with the Bighorn model? What are common issues I can expect? Can 5er be used year round with sub-zero temps in winter? We are trading a 2010 Arctic Fox, the floorplan doesn't work well, way to many small issues that all added up, with little or no help from the manufacturer. We have no loacl dealer and purchased the unit out of state. Any replies will be apprecated.