Generator trailers have been done before, as Piwoslaw mentioned. As have "pusher" trailers. So the options are out there for you to study:
A few links:
AC Propulsion generator trailer for its Tzero electric car:
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AC Propulsion also produced a portable internal combustion powered generator mounted on a trailer known as the Long Ranger that could be towed behind the car and feed power to the batteries during travel. The trailer used a 500 cc Kawasaki engine with a 9.5 U.S. gallon (40 liter) fuel tank and achieved 30 to 35 mpg over at least 20,000 highway miles. It is rated at 20 kW DC output and can maintain 60 to 80 mph. Video footage of the backtracking feature, which allows drivers to easily back a trailer through a set of slalom cones.
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AC Propulsion tzero - Wikipedia, the free encyclopedia
Example of a "pusher" trailer:
EV Pusher Trailer
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The idea of the pusher trailer and/or generator trailer is to give the normal EV long-range capability with fast fuel stops without permanantly installing an IC hybrid system in the vehicle. This saves the weight, and complexity, of having the IC engine with you (in the EV) for the 80+% of driving that is done within the EV's normal range. For long-range operation, the IC engine will take over all of the load and battery drain will cease or slowly reverse.
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On that page, the builder also lays out the pros & cons of pushers and generators.