for new nitro I'd say Hyper 7 TQ black as those can take some abuse, and 1/8th scale buggies height, and size are the same as the MT2 you mentioned
Old pick I use for comparison next to my Jammin X1x CR Those were Mashers I believe n the MT2 also where the stock ones were lower. Only use that pic as 1/8th scale buggies are all the same physical size(due to race limitations)
Depending on grass height, and stiffness (I'd say about .5-1 inch) it could go through. After that not many RC's will run (well maybe a Savage would have little issues)
As for electric... those can be hit or miss I've bought a few I bought a used Stampede turns out it was missing parts that were unable to be seen as he just slapped the tires on any old way to make it look nice. Bought a slash 4X4 the back plate that holds the rear arms on was cracked in half, and glued together poorly... Didn't show up in the pic It also needed a few other parts that guy broke, and just CA glued together to make it look like it was in running condition.
Other then those 2 the rest were bought new cause I usually got killer deals on em from model closeouts. Hell I netted a $350 RTR for $100 last year(Vaterra Kalahari)
Or when I was buying crt .5's for $85 each or my SCRT10 I got for $100 shipped NIB