Track looks great! Real dirt

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Any 1/10 scale truck or larger RC, and you'll be fine. Heck, I'd probably even run 1/10 scale buggies and stadium trucks on that track. I got rid of my 1/10 scale buggies, because my track was getting a bit too rough. I can't really tell the bumpiness of your track, but to be on the safe side... anything 4wd short course truck and larger would be your best bet. The larger and heavier... the better IMO. I use my Kraton EXB to break up the dirt on my track if it has been not used in awhile. That's the heaviest RC I own... takes the rough stuff/bumps/ruts with ease

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For me, I would not worry about smoothing things out. After a few days of consecutive running your RCs on there, and things will take shape. The wood/log guidrails gotta go if doing anything with substantial speed. Enjoy all the aspects of an off-road RC on you track... put them shocks to use!