Hi Rpowell63,
Welcome to the Heartland Owners Forum. There's lots of useful information here along with a great bunch of friendly and helpful people who are quick to reach out with help when you need it.
Lippert makes the frame on your trailer and also warrants it. If you called Lippert to ask them, they'd surely tell you it would void the frame warranty.
There are also issues with state laws that vary around the country. In some places it's illegal to have double trailers. In some places, you might exceed the legal length for tow/towed vehicles.
And of course there are likely to be handling and safety issues.