towing opinions on car dolly

Closer its getting to Carlisle the more I want to bring my Duster with me. I trailered twice with my brothers 5.4L truck years past but now his car is done so he trailers it down instead.
I only have a 4.0L Ranger/auto trans and the combined weight of trailer and car would be well over 5,000 lbs. which is a bit too much to risk for 300 miles 1 way. Ranger does have the factory tow pkg. and I've seen people tow boats easily. I'm definitely not driving the car that far, especially in the mid summer heat.

Opinions on car dolly? It would be much less expensive than a fullsize trailer for sure, but I'm concerned about any possible issues I should kow.