First Tahoe vs Silverado in the towing world is like apples vs oranges. The truck is meant/built for towing/hauling. The Tahoe is built for comfort, groceries and going to the store. The towing differences reflect that along with the increased weight of an SUV vs an open bed pickup.
Look at the specs for that Silverado and see what class hitch it comes with with whatever package it has; class III, IV etc. That will give you some guidance on the receiver itself. The brochures will probably give you the max weight for the hitch with or without a weight distributing hitch. Without looking at a specific truck all you can do is spec out the truck you want and see what they say the payload is; which is what you need to go by. Completely, totally forget about the max tow rating for either vehicle - it is meaningless and will have zero bearing on the vehicle YOU will be buying.
You are wise to replace the Tundra with the Silverado (Tahoe not so much). The Silverado will be much more capable at towing than the Tundra.
Danny & Susan wife of 53 years
2019 Ram 3500 Laramie CC SB 6.4 4x4 4.10
2020 Montana High Country 331RL