Pop-up TCs and Bear Boxes, etc

Thanks, both of you. I'm assuming "turtling it" means keeping the top lowered. If the bears are THAT much of a problem, I sure don't want to be in a tent....

Depends on the individual area. Some places may have rules that you can only have a pop-up/hybrid if you turtle it - including TCs. In some area, bears have learned the differences. If they don't require you to turtle it, then you should be fine.

Just use common sense:

Don't leave food/drinks/coolers out in view (whether inside the RV, the truck, or outside). Bears don't just go by smell, they go by sight. They know a cooler means food - so if they see a cooler, they will go for it even if it's locked inside a vehicle.

Clean up promptly and dump your trash in the bins daily. This keeps smells at a minimum.

Don't throw food waste around the campground - including bones, banana peels, orange peels, apple cores, etc. (yes, people do that and don't think about it bringing in bears). If you're hiking around, carry your waste back to camp and dispose of it in a bin.

When you see campsite ban pop-up campers due to bear activity, generally they're referring to the pop-up trailers which are basically just a tent with a hard floor on wheels.

A few years ago there was a bear problem at camp sites near Yellowstone
Tent camping banned at 3 sites near Yellowstone

The forest is allowing hard-sided vehicles made of metal or strong composite plastic to be used at the three campgrounds. Truck-box campers that have a 4-foot high hard side, in addition to a raised upper section, are permissible, but tents and pop-up campers are excluded, as is camping without a shelter.