Don't have a Motorhome.... it'd be stretching truth to breaking point (and miffing owners of proper MH to be associated haha).
Do have a homebuilt campervan though.
Despite being considered to be butt-ugly on sight when presented to OH and her not being keen at all, I liked the thing, saw some potential and bought it. Once OH had actually been out in the van, she decided that despite being butt-ugly on the outside, that it was nice to be in, and enjoyed herself.
She promptly dubbed our LDV Convoy to be 'Sully' (after the dirty great Monster from the kids movie 'Monsters Inc.' - guess OH saw the symmetry there), and the name stuck.
"Sully" the van has been known as ever since.