Should I connect my sewer line when camping?

When I get to the campground I fill the black tank halfway. use it till it reaches 3/4 and then dump and start over. usually the hose is always hooked up. I have a separate valve for my grey water and usually let those get to 3/4 as well and empty those after dumping the black tank.

by all means for conservation and to reduce buildup of the dreaded Poo Pyramid it is best to allow your black tank to fill to capacity before dumping. Enough water must be used to do a flush.
In regularly below freezing weather this is not an option waste Tank valves must be left open so no 'trap' and sufficient water used ( flush twice) to move the waste. This works in warm weather also but does ise extra water and take education particularly of the younger folks.. In any case enough water must be used to make the solids more fluid.
The old saying is valid, ' flush twice, its a long way to the kitchen'

another good reason is it's is just one step you don't have to do when you already have a long list of things that more important to do when setting up camp

I leave the hose stored away until ready to dump. If I'm going to have to dump again in the future I leave it attached. Otherwise it gets stored and I drive home.

I always connect and leave the hose on because if we have sewer we are staying for a few days.

Gray tank always open with a p-trap bend in the hose to prevent gas back flow. I want to shower like a homeowner and not a sailor when possible.

Black tank has to remain closed until ready to dump. A dry/empty black tank will never evacuate solids properly and it will all just sit there and stink like an outhouse. You need to have it 1/4 full minimum with water at all times to let the solids submerge, keep the odor down and not get rock hard. Dump when full, add water and repeat.

And the eagles, hawks and songbirds.

I have been warned at one campground that if I left my hose connected, that the ravens/crows would rip holes in the hose looking for food particles.

Hook up when you are ready to dump....one-half to two-thirds full. If leaving and not that full, add water.

I prefer to connect each time I dump. I'm rarely in the same place for very long.

I don't like sewer flies.

I dump my black tank once every 21 days and the gray tank once a week.