Our kids are a little older now, 14 and 12, but when we first started RVing they were both in Car Seats. We went from a Travel Trailer to a Motorhome after we moved to GA. Traveling back and forth to see family in NJ with the TT was a hassle and usually required a stay over. We'd have to stop every 150 to 200 miles or so for gas and then have to stop for potty breaks and food. With kids the age your kids are, potty breaks can be often.
The 800 mile trip in the MH is a breeze and is done in one day. They both have laptops, one has a Kindle and the other my old de-activated SmartPhone to pass the time. In the MH, we get off the highway for fuel stops (usually 2) and 1 meal, the other meal is in the MH. They can go to the bathroom as needed without stopping and if they need a snack, they can get it.
We just did the trip a couple weeks ago. Left NJ at 10:30 am and got to GA at 12:30 am. We did stop for lunch and dinner due to poor planning on our part. I drove the entire trip (always do), stopped twice for gas. Although, if it was up to me, I wouldn't stop for meals. When I do the trip solo, it's two stops for fuel and without traffic it is a 12.5 hour drive.
Your 8 year old is old enough to bring along what they need to pass the time. The 5 year old might need some help. Books, crayons and paper, card games and board games and maybe a couple hours watching a movie will pass the time. Just having the extra room in the MH vs. the truck should make them happy at least for the first hour or two. When they get a little older, it will be a lot easier.
-Michael
