the vaterra plastic is very strong! i doubt you will bust the battery tray mounts off using them as a RULR, but one of the Vaterra alloy option parts is the battery tray mounts, two small seperate alloy pieces, I always though they were RULR's in disguise! not free though......
X2, I've got those optional Vaterra aluminum mounts and they are very nice! "thumbsup"
...Still not sure about the tires. Im using proline dual stage inners and some home made outers. There were things Iv climbed pretty easy with the hyrax tires and these struggled and sections where I didn’t think I had a chance and they made it up no problem. I’ll give it another pack or 2 to break in and then test them against my other tires but I think they do look pretty cool.
Tires look great, but they need the mold release soaked and scrubbed off with Simple Green and water to get them started. Unless they are just terrible (which I doubt) I'd give them a month of crawling to get broken in properly. Some different foams might help too, but use them awhile first. "thumbsup"