ValBE,
Welcome to the Forum!! Lots of good information so far. Having had both a Class C and trailers, I have a few comments. First about the child seat. I have not seen dinette seats in motorhomes that have both a lap belt and a shoulder harness, so I am not sure that any seat other than the passenger seat in the cockpit will allow proper attachment of a child seat designed to be held by a lap/shoulder harness type seat belt. I personally don't see it as a big issue, but I do not think Class A motorhomes other than those on a Provost or MCI chassis have any real roll over protection and the rollover protection in a Class C is limited to the cab.
If you choose a motorhome and a toad, you can not backup with the toad attached. While newer parks and campgrounds are tending toward all pull thru sites, there are still lots of places like Forest Service campgrounds that have backin sites. You do not have to unhook the trailer from the tow vehicle to use it if the site is fairly level. We rarely unhook for overnights while traveling between destinations. The water, electric and sewer hookups for all RVs are basically the same. Some of the larger or more expensive motorhomes have automatic leveling so setup may be faster for them.
If I am correct in remembering that your current vehicle has a tow capacity of 5,000#; you will be limited to the smallest of travel trailers unless you upgrade. You might want to check into whether it can be towed behind a motorhome without modification or use of a tow dolly as part of your decision making process.
Good Luck with your search for the right RV for you and your family.