Be interesting to see how silicone cap tires would work. Take foam tires, coat the surface with GE silicone RTV and let it cure. Now you have silicone cap tires. Used to be the most awesome tires for running indoor clay dirt oval, many years ago. Worked so good, ROAR outlawed them. Best part was they never wore out. Fairly easy to make a set to test, worth a try.
Serpent SRX8 electric
Serpent Cobra 811TE-E
Serpent S120LTR 17.5 1/12th and S100LTR Pro-10
Serpent S411 Eryx 4.0 USGT
Team Serpent America and Desoto Racing