Unless you plan on using the van with most of its towing capacity. I pull a car trailer with mine sometimes. Loaded weight trailer is ~4100 lbs or less for me. The class 2 is only rated at 3500 lbs.I bought this hitch on Amazon and installed it in about an hour.
Yes, it's a class II, which is totally adequate for any Astro/Safari.
If you're towing something behind an Astro that requires a class III hitch, you're doing it wrong.
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