(I'm not going to discuss your trailer type and tow vehicle type here, and try to stay on your topic.)
First ... your speed. Regardless of how far you tow a trailer, you can expect an estimated "average" of 50 mph. The longer the distance you are traveling, the more true this is. Meaning ... you are physically traveling only 50 miles every hour. This takes into account rest stops, fuel stops, food stops, bathroom breaks, and just time to stretch.
Speed? You do not want to tow any faster than what your trailer tires are rated for. (Most) are rated at 65 mph. Different tires may have an 80 mph rating. Most likely, if your's is the original tires on your camper, they are rated at 65 mph. You do not want to travel any faster than that.
More than likely, your true highway speed will be, between 60 and 62 mph.
(but your over all average for the trip, will still be 50 miles an hour).
Plan on lots of stops so the dirver(s) don't get fatigued. And besides, with a "little one" strapped to a car seat, the toddler will become cranky. Beside, changing diapers, food, and spills will result in even more stops along the way. Do not attempt to change diapers and such in the back seat while the driver continues on so you won't loose time. Take the time and actually STOP to change those diapers. Beside, it's the law. In a moving vehicle, the child must be in a car seat. It's just too risky to NOT stop and do it right.
Plan your route out well before you leave. Anticipate the distances you can travel between fill ups. Adjust your "pit stops" accordingly and your overnights too.
Do spend your overnights in an established campground where you can plug into electricity, get a good shower and a good meal. Driving long distances, you can become very irritable very fast by the second day if you are not well fed and clean! Besides, WalMart parking has it's risks, and you do have a 2 year old child to consider. So do overnight stops at real campgrounds, like KOA or GoodSam campgrounds (they both have apps for your cell phone).
Get the app, "Gas Buddy" on your phone. It's a life saver traveling to new location and looking for a gas station. Down load it now, and start using it now so you have familarity with it. It's absolutely priceless when traveling.
Every time you stop somewhere, do a quick walk around your entire "rig" and make sure everything is still OK. 99.9 percent of the time it is. But that 0.1 percent of the time, something could come loose, or find a bumper cap missing, or a plug cover wiggled loose. Also, check your turn signals and brake lights on the trailer often.
Bring along easy to fix meals and keep that in the camper, like sandwiches and Jello cups and such. Works great, and save a LOT of money eating at McDonalds along the way. However, it is nice to go inside and sit down too, but not every time. You loose a lot of time this way.
If you park for the night, you do not necessarily need to unhitch the tow vehicle from the trailer. Just unplug the trailer pig-tail from the tow vehicle and plug the trailer into shore power. If you have slides, follow your camper's manufacturer advise if you should lower the stabilizer jacks or not first. If so, then do it. It only takes a minute to lower them and makes for more stable experience inside the camper.
It sounds like you have a specific destination in mind, but don't forget .... traveling there is half the fun too! Don't short cut the driving experience and all that can be seen and done along the way. If you see an interesting amusement, restraunt, event, shop, or unusual site, overlook, or scenic view, take the time and stop and see it. The unknown, unexpected, unanticipated stops are often the ones you remember the most years later.
Most of all, have fun! Make the entire experience a fun experience for everyone. Please don't drive like your on a race to the moon! Enjoy every moment of the experience ... even the planning stages you are in right now. It's all part of the "adventure." Make it all meaningful. That's the MOST important thing!
