Oops, I should have posted “90 mph” including a headwind gust.
And I typo’d the gust! Assume 30 mph (headwind gust) + 60 mph towing speed.
spoiler alert?
You forgot to state how much beer is involved...
It wont go anywhere unless you put wings on it.
The only reason you need it level is it’s easier to hook up and you don’t drag the back off the trailer when your trailer tire goes through a hole.
According to my Chapman’s Piloting text, wind force is...
P= K V(square). K= .004, V velocity in mph, P= lbs/ sq. ft.
Velocity sq x .004 = wind force in lb / sq ft.
( over 100 mph K= .005)
At 75 mph...22.5 lb/ sq ft.....100 mph... 50 lb/ sq ft
Should be able to get a rough estimate from that.