You could do that trip in a Ford Fiesta if you wanted. The nordic countries have a pretty well developed road network, even in the north  The only "issue" might be bumps due to frost heave but it's nothing any car can't manage. Depending on where you enter, I recommend the Sognefjord area on the way up. It's really beautiful and very fun, twisty roads, even the E-roads. The issue in Norway is likely to be the death defying Norwegian drivers that regularly drive 20-30 km/h above the speed limit.
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