The 2 litre Sportage has a kerb weight of 1600kgs, this would give an advised weight of 1360kgs for your van, if you adhere to the recommended 85% ratio. This would then depend on what the MTPLM of your Pastiche is, and they vary from the Genoa @ 1286 to the Turin @ 1676, so you need to check that out first..
I have a Model 2 Sportage, new in 2010 and with 52,000 miles, of which at least half has been towing our Swift 565 all over Europe, with no problems. I am extremely pleased with Kia, the small problems I have had, have all been fixed under the warranty, and we still have 2 years to go with it.