The parts for these truck aren't the same as parts for "more serious" RC trucks, like 1:10 scale and so forth. I've had to find the parts at totally different outlets than the "real'" RC parts. Hobby stores won't have much if anything.
Injora has a good selection of wheels and tires that will likely fit, and I like them better than anything else. Check the size of the hex at the end of the axles and make sure it fits the wheel. There's tons of aftermarket parts for this scale of Chinese RC on Amazon, Banggood, etc. Some are junk and some are good, it's trial and error. A lot of times the parts aren't stored in the US and they take a month to come from China, but I've seen more parts stocked over here in the past year. Like regular trucks, tires are #1. Wheels are probably #2 in my opinion, because the aftermarket metal ones wheigh more and lower the center of gravity. I found about 15-20g wheels to be the best. Any more weight and even an upgraded motor has trouble turning them. I ran 68g wheels for about two days and it didn't work out very well! Higher spec batteries are also good to have. More mAh means more power to the motor initially (within the limits of the ESC, which is kind of like an ECU for cars, the ESC controls the motor & fuel, or battery in this case), as well as a longer lasting run time. An upgraded ESC is nice, but I wouldn't put it ahead of tires/wheels or battery. An upgraded motor is a good idea. Not sure what these trucks come with but a 360 motor is as big as I would go, and doing that in conjunction with the ESC is a good idea. Suspension and all that jazz I would put last. It's a good uprgade, but the other upgrades will be a better bang for the buck up front, and suspension stuff can cause secondary issues that need solving so you might chase your tail. Don't be afraid to DIY too. The small hardware bins at Ace or True Value can have just the right screws or bolts or nuts to fabricate homebrew suspension or whatever else. Hobby stores sometimes have more RC-specific small hardware too. I found some M3 heim joints a while back, they were in the RC airplane section of a local shop. I've drilled out the tray holding the electronics in my truck just to install new gizmos and to add stabilizers for the body, etc. I hacked my wheel arches to get rid of rub. Chopped stuff to add a raised rear bumper for better clearance. I figure for under $100, who cares!
All that being said, I run a WPL C24 and not this MN82, but they are very very similar and probably come out of the same factory. The same parent company owns WPL, MN, and many other small brands of these oddball-scale cheap RC trucks.
