Being solo I wanted one that I could put dimensions in as I dreaded having to reverse back to get out of a tight spot, so bought a Camper one. I have TomToms in my cars and like the system, so I got the TomTom Camper model. The mapping and directions are pretty good.
There's nothing really 'camper' about it except it has some POI (Points Of Interest) that are campgrounds (I think). It's obviously just a truck sat nav. If you want to go from A to B, there is no 'scenic' option, just fast, short or Eco. You can ban Motorways, tolls, ferries, unpaved roads, carpool lanes, tunnels, country borders.
What I found is it will take the most boring route unless you 'design' it by turning off motorways and/or using their MyGuide site to plot a route beforehand where you can see the scenic routes or even load one of their preconfigured tours. Once you've designed the route, you can send it to the TomTom. This can be time consuming, but once you get the hang of it works pretty well.
One really annoying thing is they lump the maps together as Europe so as someone above said they are ridiculously huge. Too big to get over a limited data sim deal so make sure you update it at home before you go and not while travelling. It'd be nice if you could just pick updates for the countries you wanted.
All the camper ones seem way overpriced (TomTom, Garmin, Aguri). They don't have enough camper features to warrant it. If you could manage without having dimensions and take the risk of getting stuck a car one would save you heaps. You could probably load campsite or aire POI's on it once you work that out.
There is no Mac specific software for the TomTom now. You just connect it via wifi to your home wifi or your phone hotspot while driving. Keep an eye on the data though as I suspect it chews up data. Something was my last trip (it could also have been a trip tracking program I had called Polarsteps). I would check the settings and turn off auto update so you can pick which ones to get.
Some sat navs can also have a reversing camera connected. I'm not sure I'd like to have the same screen do both functions.
Just on using the phone as a sat nav - it will get very hot running all the time. If you use Google Maps I don't think that has vehicle dimensions yet (if that matters to you).
These are really good phone mounts. You stick a round disk on the dashboard and the mount sucks onto that. Easy one hand in or out. You can turn the phone to landscape mode for better photo position.