What's the minimum jack stand height needed to support a standard first generation Ridgeline? Any suggestions for a good set of jack stands?

I don't have a trailer but want to be set up to rent a small U-Haul trailer should the need arise. Nothing big, just to haul the lawn mower or some furniture. My questions are: 1- What drop distance should I go for? 2- What ball size do utility trailers typically use? I understand that there...