I have a viper snowmachine that i like alot. the thing i do not like is i ride by myself almost everytime and getting it unstuck or just turning it around is a hassle.
there are several dirtbike track kits out with the 2moto.com kit being the best and most expensive 4400!!!! the explorer is a little cheaper but not rated as high tho.
whats your opinion 300lbs and maintanence on 1 bike sounds better than 2 bikes and 600lbs to me