Well Tucson (I assume you mean AZ) is one of the better places to keep a sulcata in North america. But there are things to consider:
The size alone (think lots of food, BIG poops, strong and when willfull, a real pain, rearranger of furniture, landscaping (seriously) and hard to move if you ned to clean it or treat it medically...vet home visits)
Room (got a big yard?)
Digging (a possibility but many keepers say not attempted as much if a ready made hide is porvided)
Food (you will have to provide at least some cactus, grasses, weeds and flowers; the grocery greens alone won't cut it. Most keepers eventually plant an area for natural grazing. Fortunately in Az there are all sorts of wild plants that are edible and beneficial to torts from xeric regions, but you still have to get them)
Dependency (many sulcatas become attached to people and follow them around. This may be good or bad depending upon your perspective)
Weather (even in Southern Arizona it will be an issue (its raining like crazy and 48 right as I write this here in Phoenix. On those cold days a warm shelter will be needed)
Theft (believe it or not tort theft is an issue in some places. It certainly is in Phoenix (and not just in exceptionally affluent or impoverished districts) where lots of people have their yards invaded and torts stolen. This invites theft of other things and nobody likes property invasion. If you get one. Don't tell every body.)
Neighbors (some places with HOA or local ordinaces don't deal well with reptiles in yards. In Az i haven't seen this to be as much of a problem as back East but its not unheard of here at all.)
and worst of all:
Addiction (you can't have just one torttoise! well you can but they grow on you)
Of course if you can handle it it would be great to do as the country is over run with unwanted big sulcatas that need a good home.
With that said you should really read this stuff if you haven't already done so:
sulcata station
article written to disuade potentially naive new sulcata owners, aimed more at those looking to purchase a baby which may then need to be adopted but still worth reading
sulcata care at WCT