I own a 2007 Fuzion 362 and the only problems I have had were the decals coming off, electric part of the water heater, and just the typical DIY fixes that come with owning a toy hauler. Also the fact that everyone wants to hang out in it while camping, but that's what it is for.
I removed all of the decals and got lucky to get a new set under warranty that I have not even put on. I just run the water heater of propane since it is not a big deal for me.
It is really well built and can't complain about it except the fact it is big. I am actually thinking of downgrading to something shorter, but can't seem to find anything in the 28'-30' range I like.
We usually take it camping 3-4 times during the riding season and we leave it at the river for 3 months during the summer. Have not had any big issues dry camping or when hooked up full time during the summer.
One other issue is the ducted A/C. It works well in the main kitchen area, but doesn't do well in the garage area which I have read others say too. I have duel A/C so just leave the garage door open when people use the back for sleeping at the river.