I worked in a quilt shop/sewing machine store for 9 years, and they sold Janome & Singer. The small Janome Gems were great, and we did sell them to a lot of ladies traveling in RV's.
A neighbor of mine, who is now a dear friend, was a full time RVer and had several Singer featherweights, but used her Janome Gem for everything. We had no warranty problems with them, and had very little repair work from the Janomes, except for routine servicing.
Naturally, I'm a Janome advocate (even though I no longer work there) and have 3 Janome machines, and both my sisters and nieces all have Janomes, along with four quilting buddies. NOT ONE of us has had any trouble or repairs with them.
Think of all your traveling too...there are Janome dealers all over the country for accessories, etc. GO FOR IT!