Abstract: A method and system are provided for installation in a vehicle having an air suspension system comprising four air beams, each supported over a vehicle axle by bellows supplied by air from an air tank, and under control of one front and two rear height control valves. Manually selective leveling control apparatus is installed in this system for leveling the vehicle, particularly when the vehicle (which has been converted from a bus to a motor home) is parked. Four five-way ball leveling valves are installed in the air suspension system. Each leveling valve is installed between a different height control valve, the bellows of an air beam, and the common air tank.

Abstract: Described herein is a novel class of compounds of formula ##STR1## where R is a hydrogen or linear alkyl group of from 1 to about 11 carbon atoms. The compounds are prepared by dihydroxylation of a 3-alken-1-ol, e.g., by peroxidation in formic acid to the Formate ester which latter is hydrolyzed to the 1,3,4-triol of the invention. The multifunctional compounds can be converted to surfactants, emulsifiers and lubricants, and are useful in the formation of urethanes and alkyd-type resins.