Single axle trailer you won't have to worry as much as long as it's close. I drive a Silverado 2500 Z71 and have a single axel trailer, I use a 3 and 1/4 inch drop for the single axel trailer, also pull a horse trailer with tandem axle and have to use a 5 inch drop. The tongue is lower on the horse trailer.
It all depends on the trailer. You can always buy a receiver and return it for a different size if necessary. I don't know enough about the adjustable receivers to comment there.
Edited by MagFluker (03/31/16 02:46 PM)
Faith. Family. Fishing.
PB - 11 lbs 1 oz