You had a truck and toy hauler with the trike inside it. Now you will have a Class C with a trailer that has the trike in it.
So instead of being able to park the toy hauler and get around town in the truck, now you have to get around on the trike.
So it is all about whether the trike can get it all done instead of the truck. (Bags of groceries in the rain?) You are the only one who knows that.
On the size of the Class C, agree with getting a longer one since you are used to a longer trailer. You don't want to feel cooped up. We went from a 28 ft 5er to a 28 ft C. Been in a 24 ft C. No thanks!!!!
On the Class C being able to tow something like your trike trailer, I know little, but beware that Class Cs are built near or over being overloaded at the rear, so check for what the tongue weight will do. Also of course, whether the Class C has the towing capacity in the engine /drive train.
We like the two swivel chairs in the side opposite the dinette instead of a couch there. You can swivel and look out that side's window, but you can't do that on a couch without getting a kink somewhere in your no-longer young body. :(