I know the OP is talking about a 28' C but just for grins consider the possibilities that present themselves if your rig is just a tad smaller. We have only had our 24' Class C for four months but have covered over 8,000 miles. We do not have, nor do we need much less want a Toad. Our 24' C has every amenity we could ever want and I can park it just about anywhere. It will go down any road safely and I have yet to find a site that it won't easily fit. Now if you cannot live with a rig this size it becomes a different ball game altogether.
We got our 24 because we knew it would meet our needs without the "need" to pull a second vehicle. For 4 years we towed a 22' TT and had the nearly the same amenities as the 24' C with the TV available for errands and site seeing so we know there is nothing we are missing. Since we are in mostly campgrounds going into town for something is as simple as turning the ignition key and if we happen to have 30 amp service disconnecting takes about 30 seconds.
IMHO: In a Class C or B/B+ of 25' or less a Toad is an expensive, needless appendage which defeats the simplicity of having such a rig in the first place. If you have just got to have a bigger C maybe you might find a better fit with a Class A which will certainly handle a Toad better.
As always.... Opinions and YMMV (especially if you are dragging a Toad). :B