The voyage air om is the same size (body, full scale, 1.75 nut) as the Martin om, and it folds up which may be nice since space can be tight in an rv. Vaom04 has solid top and the vaom02 has laminate top. I have a vaom04 and think it is very good and certainly the best travel guitar i’ve owned. Here is a link to a video of Rolly Brown playing an om Martin and om voyage air:
http://www.voyageairguitar.com/rolly-brown