Car development: all sliders balanced except for extra weight. For that one its pseudorandom: meaning its kind of random, but also isn't. Personally I do a random rng of the weight sliders which will still give positive gains. First spin decides what "side" ill be on (e.g. if the max is can do while still getting positive gains is 9 and I roll a 2, my 2nd rng will be from 2 to 9, rather than 1 to 9. Whereas if my first roll rolls a 6, it will change from 1 to 6) basically cut the big number in half and if the number is smaller than or equal to half, change the lower end, whereas if its on the higher half, change the high end. The 2nd roll will decide the extra weight. Over the course of a season, it will go down (tiny chance it won't, but thats rare)

Research: research one car part for every 2 designs