Rear main seal leak

I was supposed to leave Michigan this morning for a 2 month trip to FLA. I have a 1997 Xplorer 230XL, a 20' Class B on a dodge ram van 3500 chassis. I had noticed a small oil spot under my engine & took it to my nearby dodge dealer who has worked on it for over a decade. I have spent $2500 on repairs this past year there. (I plan on keeping it for another 15-20 years & take immaculate care of it).

The service manager said it was a small leak at the engine's rear main seal. He then told me he had talked to the dealer owner and they would no longer do any big engine work on my vehicle due to it's age and mileage, a 1997 with 180,000 miles. I was shocked. If it's every needed I'm willing to put in a new engine. A few years ago they quoted a price for that. Now he said they would not do that work either. He said they would do small repairs that do not require taking the engine apart or other heavy work. They said it could open a can of worms showing other costly work to be done. I said I would pay for all repairs.

I plan on taking it to another local shop this morning to see if they will do the job. They have a good rep, but do not know if my 9' height will allow them to work on it. I have a 2nd place I could take it for an estimate.

Does anyone know if this is a big deal or could I still take my 2 month, 4000 mile trip & just check the oil levels? I do not want to have to be broken down on this trip.