Q: WHAT IS THE RATING FOR TANDEM?
A: We no not down-rate tandem installations. The weight rating for a tandem is simply the sum of the axle ratings.
Q: CAN WE USE A 1500KG AND A 2000KG IN A TANDEM TRAILER?
A: No technical reason this should not work. The beam of the 1500 is 80mm square, the beam of the 2000 is 90mm square, without shim the 2000 will sit 5mm lower to the ground.
Q: WHICH WHEELS WILL FIT?
A: Check at this site for the stud pattern: https://www.wheel-size.com/pcd/ . Also check the wheel offset on wheels wider than 195. You will need to look at the axle drawings and determine if the rubber may touch the swing-arm.