Great, you can never have too many bikes.
One advantage of the sidecar though is that it makes your bike larger when squashing foot models, some extra ramming area combined with the wider profile comes in very handy as you can easily track down and squash any models foolish enough to be on foot while you can still outrun any trucks around.
I never thought of it like that. Gorkamorka is definitely a game where modeling for advantage seems to be encouraged. I might do a mega-bike with a side car and have a 2-3 person transport capacity.