Vmbe is usually NOT a ldg factor [except in rare case such as a 757 coming in at MTOW as a result of an emergency] to a low Density alt
. I think the factor on ldg is 1.5% of the BE required for stopping at the highest Vref., and NO margins on the RTO at the Highest BF V1.
But as John Tullamarine warns all the time...Check you airplane's certifcation against the Applicable, CARs,JARs,FARs.
To The Tire Speed Limits And Beyond
rhov