"High" is a relative term. Otherwise, the rolling resistance ( friction) of the tandem axle Lightship must be quite "High" and certainly much greater than that of a Trailmanor. Likewise the grade resistance at over twice the weight of a Trailmanor is very "High". Both offset temporarily, ie., for the first 300 miles, by the Trekdrive, after that you're on your own. If you're arriving at a remote boondocking location after driving 300 miles with the Trekdrive engaged you're arriving with a fully or near fully depleted battery, which would take about one week to recharge via the vehicle's solar array.
Then there's the hitch weight of ~800lbs (before loading ) and no possibility to install a Weight Distribition Hitch. The Trailmanor has a 4-500 lb hitch weight ( depending on model) but that is offset with a WDH.