The diesel-operated generator weighs in at a reasonable 239 ... The Lowboy II is just that source, with the generator pushing up to 7,000 watts of energy at standby and staying constant at 6,500w.
It can sustain a 5,500 watt output continuously, and as much as 7,000 watts for short bursts ... it should last 15-20 years.
Our average of how long a generator ran, over various loads, on a full tank of gasoline or diesel fuel, a 20-pound tank for propane-based portables, or a 250-gallon propane tank for stationary models.