Hi Minidoc,
Welcome to Sunline Owners Club and congrats on your new Sunny.
Yes you are correct, P rated car tires are a no no on trailers.
I looked up the 2001, T-2975 and it is a 7,000# GVWR camper. Can you look on the tires that are on there now, what size are they? 14" or 15"? In 2001 they might be either. I do not know what exact year they stopped using the 14" but by 2004 they were on 15" as the smallest.
There is a VIN tag on the front left side of the camper. It may call out the exact tire size that Sunline put on it. But... unless someone put UV treatment on the sticker it may be so faded you cannot read it.
If they are 14" rims, the size would be ST205 75/R14's load range C, 50psi max at 1,760# rating.
If they are on 15" rims, the size would be ST205 75/R15's load range C, 50psi max at 1,820# rating.
Rims, the rims need to be zero offset or the rim/tire my rub the camper. Not knowing what the prior owners mounted on there, if they used the original rims, then life is good and just change tires. If they have some kind of offset rim, that can be a problem.
The rims on the 15" tire would be 15" x 5" wide, 5 holes on 4 1/2" centers, zero offset. I just bought 4 of these myself last spring for my 2004 T-1950 as they where rusted out.
https://www.etrailer.com/Tires-and-W...r/AM20422.html
If you are wanting a tire brand recommendation here are 2 that I have used with acceptable results on ST trailer tires. You are wanting a ST (Special Trailer) tire regardless of brand and ideally it is a radial tire, not a bias tire. The spare tire needs to match the 4 good ones on the camper. The link will have the correct tread/style and type of tire.
Maxxis ST radial M8008
ST Radial M8008 | Maxxis Tires USA
Carlisle ST radial trail HD
https://www.carlislebrandtires.com/o...adial-trail-hd
Hope this helps
John
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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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