Hi Jack,
I do not know the clearance of for a 2553, but I do know that an Over-under kit is available to raise up the trailer, available directly from Dexter Axle. My dad did this to his Car Trailer a couple years ago and it really made a difference. It has a beaver tail, so the back slopes down. He wanted to take it hunting with him, to haul ATV's, a generator, firewood, etc. Taking a trailer with a clearance of 4" under the beaver tail was not a good idea, so the kit raised it another 4-6". The only issue now is that we can't put it in the garage without putting on smaller wheels with small tires (for a pop-up). It is a very simple kit to install, it just requires removing the leaf springs to remove the axles so they can be reinstalled on the underside of the leaf springs. I am assuming this trailer has the leaf spring suspension and not rubber ride.
For tips on how to flip axles, check out this link from an owner of a 1999 T-2553 who flipped his axles because he has a similar problem with his driveway also.
http://members.aol.com/stephndud2/15_16/notes15.html
Good luck with your possible purchase! Sunline is the best of the best! Just as the 1991 Sunline brochure said, "Life is even better in a Sunline"
Jon
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2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR