Eric
In 45 years caravanning I initally heaved and pushed my 'van. As Age and/or sense took over I tried a hand driven jockey wheel, a battery driven jockey wheel, a tow-ball mini tractor and finished up with a chassis mounted mover. I settled on Powrtouch as it has a 'soft start' which facilitates tiny movements, close to car or a wall these little adjustments can be vary useful if done slowly, Powrtouch are the only ones doing this and also they really honour their 5-year guarantee.
Enjoy, Peter T