Cleaning the oil pick up without dropping the pan?

I had the exact same model and the same low oil pressure issue. Changed oil and added 1 quart of ATF, drove the Carlisle while pulling a pop up camper (2200lbs). Changed oil and filter after I returned (690) miles. never had an issue with low oil pressure after that. I agree 100% on the OP sending unit first. I've had many magnums over the years.