if your not towing a trailer that is heavy the tag is not 100% essential. i would of gladly taken a tag coach over a single axle for my purposes but i haul a heavy stacker trailer behind me. i bought my first coach last week a 40' Beaver Patriot and its a single axle. never driven a Motorhome of any size before i felt it was a dream going down the road on the 8 bag magnum air ride chassis.
Tag is like a luxury option that really has no negative effects other then on your wallet.