This is just the way I do it.... I order the WPL metal axle sets, the metal transfer case and upgraded driveshafts...The smaller WPL "rock tires" ( their term) or the Lego tires look the best to me..here are some links to Aliexpress but you can get them from Amazon if you can't wait.
Axles
https://www.aliexpress.com/item/3287...14ab4c4dXw9UoY
Motor and transfer case.
https://www.aliexpress.com/item/4001...14ab4c4dXw9UoY
Tires
https://www.aliexpress.com/item/3300...27424c4d8t5UjV
See-saw
https://www.aliexpress.com/item/1005...27424c4d8t5UjV
Metal upgrade wheels
https://www.aliexpress.com/item/1005...27424c4dXRrlt2
Drive shaft upgrade
https://www.aliexpress.com/item/4000...27424c4d2QvaGX
Clone Lego tires
https://www.aliexpress.com/item/1005...27424c4dcdnJhz
These take a different rim...if you go this route let me know I think I can help there.
You can go with any or all of these.....just some ideas...