The CanyonStar ToyHauler is a beautiful RV!
But like you found the garage is limited at 1500lb loaded. Despite being on an identical 26,000lb GVWR Chassis as the Outlaw line, the weight of the build differences (like hung-wall and extra lumber used in the floor construction) consume the 1000lb on the rear axle and some on the front too.
Could you add overload air bags to the rear axle to reach the 2300lb needed for your Smart? Idunno what is the max axle rating, but worth a check. AirRide, Firestone and AirLift and others make supplemental bags for the F53.
We have an Outlaw and have read about issues with repairs under warranty. These problems are all directly traceable to the dealerships and dealer service centers failing owners. But the RV's are well built and well appointed.
We are well beyond the warranty and little fails - like you would find on a 2015 purchase. All our fixes have been DIY repairs because of the Outlaw's build method that uses widely available and common systems for everything inside the RV. There is no factory-only bits used except for the body itself.
We submit that if you want to haul your Smart inside a Class A Toy Hauler, you could be a smart buyer and find an Outlaw that fits your likes (there's been 6 floor plans over the years). That's what we did:
See these and other Class A ToyHaulers here: