I went on Trek Travel trip to Austria and Prague a few years ago, as well as a long weekend in VT.
They are very professional, the guides are great, and the hotels,food, cultural stuff was awesome.
Our ride was listed as "moderate." While it was not cycling in the Dolomites, there were several days of climbing with 12-15% grades for a few miles. Some of this was not clearly stated. We had several very strong riders in our group, a few sort of in the middle like me, and a few newbies. It seemed like a tough trip for people on hybrids who hadn't done much riding. I didn't feel bad about cutting my day short a couple of times and taking the van. The one day we should have, was a flat day of riding along the Danube. However, the temperature had gone up to like 95 degrees and several people took a cab back to the hotel to relax. We didn't and ended up getting lost on the bike path. and me stopping and dumping my water bottle over my head to cool down.
The best cycling trips to Italy, hands down, are done by Ciclismo Classico.