Welcome to the Jayco forums!
Your right, the Dakota can be a nice tow vehicle, but a lot depends on how your Dakota was spec'd (model, gear ratio, etc.), and your personal loading habits. Always think in terms of "loaded" weights (not UVW, dry, etc.), because very few of us tow empty trailers with an empty TV.
If you want to put your concerns to rest, a trip to your local CAT scale with your loaded Dakota and X20E will provide you with the "real" weight facts so you will know where you stand. Here is a helpful "how-to" link should you decide to visit a CAT scale: http://www.jaycoowners.com/showthread.php?t=3871
The following link is to a thread that another JOF member inquired about their '99' Dakota: http://www.jaycoowners.com/showthread.php?t=5588
Also, with any TV be aware of the following: http://www.jaycoowners.com/showthread.php?t=3866
If you would like to discuss in detail your specific Dakota's weight limitations, feel free to start a new thread over in the "Towing and Tow Vehicles" forum.
I'm sure you will enjoy your new X20E....., and confirming your weights may reduce any unnecessary "sweating"
Hope this helps.
2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)