Haven't been down there with a gooseneck lately, but I just go by what the signs say that they have posted. If it says something that all trucks and combinations must stop, or if it says that pickups pulling trailers must stop, I'll pull in. If they don't want to fiddle with you, they'll kick you loose in a hurry. Now if I was pulling an RV, I wouldn't worry about it - just blow right on by. I don't think they'd waste any time on a pickup pulling a family RV, it's obviously not commercial. A pickup pulling a gooseneck might be commercial, so they'd be more likely to take an interest in it.