I use an Outbacker Stealth Plus for HF/VHF & IC7000 while moving...it won't tune UHF (very well). Antenna's mounted on one of the mirrors, same location as the over the road Freightliners. The biggest problem with HF and motorhomes is the height of the antenna or current getting into the electronics of the vehicle. The base (feed point) must be away or above the vehicle. Above and you don't have much clearance, Away and you're hitting side obstructions, you're too wide. Look at the photo in my profile altho I had not converted the CB mounts for ham use. Consider a mag mount HF antenna (but not too big) if you pull a toad.
Parked...lots of possibilities, vertical or dipole.