I had the same idea and decided on a 5th wheel (2013 Forest River Wildcat 323 QB) 3 years ago. I already had the Diesel (04 F250 powerstroke crew cab long bed)to pull it so it made more sense for us. Glad I did because at the time we were going to travel a lot ,then got a new job and well plans changed!
To echo BigE3, I believe a 5th wheel might be a better option mainly
The convenience of having the truck (not having a tow vehicle to unhook if you get in a bind )
and with a young child many 5th wheel floor plans are more conducive in function, like having a bunk house or separate room for your kid to sleep ! many RVs that I have seen have mostly the same full timers floor plan and very few with a separate room per say. If that’s not a big deal then you’re good to go.
We average about 45-60 Days a summer camping in our 5th wheel and although never owned a coach, we really love and enjoy our 5th wheel. Depending on what you buy I also think you may take less of a hit on a camper and a truck versus a coach.
I’m sure you’ve thought of this but hit up a few different RV lots and check them out to really get a feel for how little or more room you think you could live in!
Prior to this we owned a 25 foot Jayco hybrid ( hard sided but fold out beds like a pop up) that was really nice for just the wife and I.
Once our first kid came, we sold it to upgrade to the new 5th wheel.
You’re welcome to come check my 5th out , see if that’s even an option and how we set it up.