I upgraded to a 30 foot Furrion cord and have been happy with it for the past several years. For things like this I personally prefer a known name brand over a no-name Ebay product. The Ebay one may be fine, but I don't like to mess around with cheap electrical things.
I also still have my OEM 25' 30-amp cord in the garage somewhere and would be willing to sell that, but shipping would likely make it more than the Ebay one unless you are local (doubtful as I'm in Philadelphia).
Depending on the age of your van, it canít hurt to replace the 30 amp inlet fitting, too. They arenít that expensive (in the $30s maybe) and are easy to replace. The Furrion inlet is nice, as an active power LED, and matches well with their cord. SMB has a good price on it in their store (cheaper than Amazon when I bought).
That Ebay cord looks real Chinese. You can get the parts right there at the Depot and make your own.
I going to stand corrected here. The price of the parts at Home Depot comes to $88 and change not including tax. Then there's the quality time spent assembling the dang thing. The upside being you can open up the connectors and maintain them.