I don't know. Seems they don't think it is strong enough. This is the reply I received from my question.
Hello,
You asked the following question regarding the product "Rugged Ridge 11548.01 Spartan Front Bumper with High Clearance Ends & Overrider for 07-18 Jeep Wrangler JK "
https://www.quadratec.com/p/rugged-ridge/spartan-front-bumper-high-clear...
Your Question:
Can I use this bumper with tow bar brackets instead of the D rings so that I can pull my Jeep behind my motor home?
Our Answer:
No, this bumper is not rated for flat towing
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