Hello Louis,
The Keytroller and Toyota systems are good solutions but one piece of advice is to choose a system that can provide good local service & technical support. Parts, Service and IT advice is critical to successful implementations and ROI. Keytroller has good phone support but it is always nice to have a knowledgable dealer on site. The Toyota system is ID Systems based cellular solution (PowerBox in the USA) private labelled by Toyota. The Crown system is a reversed engineered version of ID Systems from several years ago.
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