I've just taken my first trip (1800 miles) with a brand new Allegro 32' MH. It has a Workhorse chassis (8.1L w/Allison). This rig has plenty of power, but on 4%-6% grades, with the engine pulling between 3,800 rpm and 4,200 rpm (depending on the grade & gear I'm in) the oil pressure light and warning buzzer come on. If I back off just a bit (couple of hundred rpm), or the road levels out the light and buzzer go off. At times, I've still got 2/3 to 3/4 pedal left, and can only go 30 - 40 miles per hour (a real bummer for a chassis/engine this powerful). It only does this on steep grades. On the flat, no problems. Oil level is full. Can't get it into the dealer for several weeks, but need to drive it in the meantime. Anyone else having this problem??? Thanks.