Because I have a short bed pickup (Silverado extended cab, 6.5 feet bed), I would like to consider replacing the stock pin box on my Solitude with a Reese Sidewinder.

1. Will this cause any problems?
2. The conversion tables for the Sidewinder have Lippert model numbers that look like this: 1621, 1621HD, 1716, etc. When I look at the pin box on my Solitude it has a label that says Lippert Item # 3213771 (18,000 pounds). The numbers don't have the same format as the ones in the conversion tables. Is there a cross reference somewhere so I can get the correct Sidewinder number?

Any help or advice will be appreciated. Thanks.