Difference in finding camp spot or towing w/ 28' v 30 v 32'?

I'd say get the TT you need/want and that reflects your camping style. DW and I like the RV resort style so size doesn't matter and self containment is for rare overnighters. We have a 26' because we mostly do 1-3 night stays and very frequent trips. Our friends like the Natural settings with extended stays. They need more for extended dry docking so their camper size is bigger. They choose parks that accommodate them. We each travel in our own style and develop the itineraries that reflect them.