Want to lower my ride, possible susp. problem?

I want to drop my 1955 3/4 ton chevy (first series long bed yep its rare :moon:.), problem is they don't make drop leaf springs for it (or regular 3/4 ton springs for a matter of fact lol) . But they do have mono leaf springs for my truck, which lower it from 2 all the way up to 4 1/2 inchs. Now the question that I ask, With these mono springs (only one big leaf, kinda scares me a little) will it kill the ride quality? Also Can I still say throw my dads Harley in the back, will it still be able to be well a truck? Oh also what would be the likely hood of cracking one of these, seeing how if you did you wouldn't have 5 others still holding you up to get home on. Thanks for any info you guys can give me I no this isn't a car site but figured Ide ask. :aj: