Here is what I can sort out from the VIN number you posted. I'm not the VIN or history guru, but this might help.
The camper is a 1991 model which is usually what is registered on the title, the model number. It may have been manufactured in later 1990 up until about mid 1991 when the next years models started coming out. Sunline rolled the model years sort of like how the auto makers do, just I do not know in 1991 when they rolled from model year to model year. I think it changed as time went on.
The camper is a Sunline travel trailer camper. The start of the VIN declares the manufacture and it is a travel trailer, not a motor home or truck camper. I cannot tell what series or model Sunline you have.
The walls were a 1" nominal thickness. I believe they used 3/4" thick wood to create the 1" nominal walls. There is 1/8" wall board on the inside, and if yours has aluminum siding, then it adds a little thickness.
The camper could be between 16 to 17 ft long.
The camper has two axles.
The camper was 8554 in their manufacturing sequence.
As you can see, what may be something useful, the camper is for sure a Sunline, and it is a 1993 model.
You can look at the walls on the camper, count the axles, know it is a travel trailer and measure the length yourself.
I hope this helps some, while not all the best info, that is what I can help with.
PS. If you want to know the model, post pictures of all 4 outside walls. We can help back into a possible model from the 1991 sales brochure. Or you can, you can down load the 1991 brochure from our files section and look for your floor plan. Then from the model number, you can see some spec's that where given in the sales brochure.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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