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My 97 and my 06 took 5 gallons. Extra volume really helps with cooling.
The key to towing apart from cooling issues is low tongue weight. Towing forces in a straight line back are easily handled. A typical tow bar puts little more than the weight of the bar on the bus hitch since it pivots at both ends. A trailer does not pivot up and down so what ever weight sits on the bus hitch is what it carries on smooth roads. But that is not a static weight.
We all have driven over the whoopdee type road irregularities that bottom the front suspension and the air seat so as the rear of the bus is thrust upward as the steer axle does when the rear suspension is bottomed out the increase in weight on the hitch ramps up to a considerable degree. The bus hitch is cantilevered from the structure carrying the rear axles so the weight of the engine and transmission is hanging out there like a 10 pound weight in your hand with your arm extended.
To add support Prevost extends some stressed members down and to the rear from the upper bus structure. Keep in mind however that structure was only intended to carry the engine to an extent so adding an increased percentage of weight exposes those welds and members to far more weight than a bus is expected to carry.
A trailer, especially a heavy one needs tongue weight for stability otherwise it becomes the tail wagging the dog so addressing the structural issue becomes complex and if by now with all other factors not an issue, such as cooling, Prevost can certainly do a redesign but it is a cost versus rewards problem. Add in the difficulty cooling an 8V92 in perfect condition but with a much greater heat load it does not seem ideal.
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL