It didn't hurt his production playing on a cement floor with a rug over it in the Metrodome. The balls roll past outfielders and they get through the infield alot faster than they do at RFK. It would be interesting to know how many of those triples were on the road.
Ok, it took me awhile to figure out how to do this on the MLB site, but here goes: Guzman's 58 triples, home and away, for the last 5 years in Minnesota:
Looks like to some extent he was taking advantage of the concrete, but not to a ridiculous extent. Also, RFK is a very nice triples and doubles park, so no reason why he couldn't get big totals there if he would just hit the damn ball once in a while.