Hello Bay,
Let me first say that I have absolutely no connection with Camper trolley or any selling agents, what follows are simply my observations.
I have seen something very similar a coupe of years ago, perhaps it was the same thing, I’m not sure, however it is an interesting product.
One of the issues with the conventional A frame mover (Replacing jockey wheel or attached to hitch) is the lack of down force on the driven wheel, which limits their maximum grip. This is a problem on slopes and slippy surfaces
It usually helps to have as much weight in the device as possible, as this adds to the down force and therefore grip.
The Camper Trolley seems to have it own internal batteries, but they seem to be of a small size, which means they can't add a great deal of weight to the device. However the fact that the device is attached nearer the main axle, means it gets considerably more down force from the leverage action of the caravans Centre of Mass. This compensates somewhat for the smaller battery system.
Another primary disadvantage of typical A frame mover is the relatively small diameter of the driven wheel, which means it also has less contact area with the ground. Both these features mean they not suited to muddy or gravel conditions. The Camper trolley has large contact area tracks, which means although the down force will be greater, its spread over a larger area and will not sink so easily into soft ground.
The size and weight of the device makes it relatively easy to carry and position, in fact it looks to be much easier to attach than most of the a frame movers. Being easily detachable means it does not eat up the caravans available payload so much as does as axle mover.
Having watched the online video’s of the device, it does strike me as being quite slow compared to most axle movers, which may become a nuisance in some circumstances. Its speed does not surprise me, as to achieve the required drawbar force to move a caravan, and considering the size of the systems batteries, there can’t be massive currents available from the battery, so to compensate the motor needs to be highly geared hence the reduced speed.
It seems to be an effective halfway house between the traditional A frame and Axle mounted movers. Although it purchase price may be high, the fitting costs are minimal, and it is very easily transferred between trailers.
It will be interesting to see as the product is taken up by users to see comments and progress reports from them.
Hi Nessey, and your windyship
Inclines and grip is always an issue, and the bigger the down force the better for grip. Provided the device is fitted closer to the body or even under it, the down force could be considerably greater than for hitch mounted movers, simply because of the mechanics of the levers (distance x force). But still not as good as for axle mounted units.