OP - A few random inputs:)!
-In general, coaches will Tag will usually add increased stability, higher CCC capacity, tighter turning radius (Drive Axle is set forward more on Tag coaches.), added set of brakes for stopping, as member Executive commented a few years back - just look sexy!!!
-Negatives have been mentioned. But specifically for the coaches with mid size block engines (ISL and C9), the added weight of the Tag, will make those engines work a bit harder:)!
-All 42' coaches with Tag's are not made the same way. I consider the Tour to be a good value coach, but it is 'good value' due to component compromises by Winnebago. If i call the Tour/Meridian counter part a sold C+ to B- grade coach, then I'd call coaches like Travel Supreme, Country Coach, Monaco Executive/Signature, Newmar Mountain Aire and up, Entegra, Foretravel, to be the B+ to A- grade of coaches. (Not intended to be a complete list, and for sure it is not.). A major part that sets these coaches up a little higher in the food chain, is the choice of Chassis and Engine are higher performing over the mid quality coaches.
Each buyer needs to decide what is important to them. Many want new coaches. Many want used. I'm in the 'Used' camp:)!
Here is an opinion I've shared on many boards over many years:
"Pick your budget range, and buy the highest quality coach that fits your budget. Don't be afraid to drop years to retain higher quality to meet a budget purchase point. Quality lasts, and a higher end quality coach, remains a solid foundation to build and modify off of to make a coach 'your coach'." I also recommend retaining a good size hunk of funds beside purchase, to allow for any catch up baseline maintenance, and modifications of interior, to make it your coach.
The Tour is a fine coach, but do recommend you take the time to examine some of the top tier coaches to compare quality of build, and components used. For example, a BIG BLOCK engine can yield equal MPG to a Mid Size Block engined coach, due to the engine not working as hard, and gearing. It also provides two safety advantages of 1) More reserve power. Not for racing up a hill, but for acceleration if needed to avoid a dangerous situation; 2) Jake Compression Braking with BIG BLOCK's provide higher Braking Horse Power.
And most of all, a final opinion, which is that your opinions are what matter the most. Pick the coach that you want, for whatever your reasons are. And go out and enjoy it:)!
Happy hunting,
Smitty