Rather than an 3/4 ton if you are even "thinking" about going with a 5vr, get the 1 ton. You can thank me later, when you don't have to upgrade.
There are a few downsides to 5vrs.
1) Usually need a 1 ton to handle pin weight (depends on side of 5vr)
2) More expensive hitchgear.
3) Back of truck is full of hitchgear. Everyone I see, leaves the hitch installed.
4) Height. 5vrs are generally 1-2 ft higher than trailers. If you boondock a lot, that can become an issue. We occasionally are brushing branches with our TT. If we had a 5vr, we would have to just find another spot to boondock.
Having said all that. The DW is rumbling about wanting a toy hauler 5vr with the party deck. Sure wish I would have bought a 1 ton