Hi Dave
I think you'll find the Tucson has had an uprated engine since you drove it 2 years ago, also if you don't spin the motor up to around 1800 r.p.m when the turbo cuts in it'll probably feel gutless. If it's similar to the Sportage diesel it really comes on song with the turbo, hold it above 1800 and it tows a treat. Towed with a Fiat 1.9 t/diesel before and that came in progressively at about 1450 r.p.m.
Best regards
Tomo