No coils wont make road driving really any more dangerous, snow, sleet or rain. The only time they get scary is on the washboard the truck drives really loose like when your shocks are bad.
Yes the heavy coils will ride good if you add the correct amount of weight like bumpers and winch. Like the others stated you can drive with the heavy coils without weight and get away with it.
I was in your same situation and was going to get heavy coils but after already having previous trucks with heavy coils and no weight I decided not to get them since I was NOT able to afford bumpers yet. Since I know it was going to be 2 years maybe longer without bumpers I went with soft coils.
I also have decided on the lighter weight tube bumpers instead of the full steel ones so when I do add them the suspension might handle it. I will buy new heavy coils for front which are only $180, sell my old ones for $100 which leaves me $80 down which aint bad since I can swap them easily. For the rear I will purchase an in coil air bag setup about $100 which will stiffen up the spring and are awesome when you load the back, you can pump them up so your rear dont sag.
IMO the lc coils are best in the rear. The flex the best, they handle all road and dirt roads with ease but are a little soft, but the air bags fix that right up.