X2 on the crates.
I strongly suggest that you do some driveway camping with them 'before' you head out. They need to know that this new building you call an RV is going to fun. And not some strange place you are going to throw them in and leave. Bring them out and actually sleep in it with them at night. The next day leave them and go outside for a bit, talking to them so they know you are near. And then expand that time little by little.
This will also let you know at 'home' whether they are going to be barkers when you leave the TT. And you can correct that in the confines of your driveway not the CG.
Trust me the extra time taken at home in the driveway acclimating your pets to the RV will be well WORTH the effort when you get to your first CG. If only every one did that it.