Wheels and tires can be changed and I don't think the frame for the Revell AG K100 is that bad so what kit you want to start from is up to you, Of course you can start from the AMT K100 Aerodyne kit...but they are starting to fetch quite a lot of money too nowadays, not as much as the Revell kits but not that far from it, just now I see a couple on the auction site with asking prices from $63 to $280, the more expensive ones are BJ & The Bear kits and Tyrone Malone Transporter kits. The Revell kit has the normal 180" wheel base and the frame has to be lengthened to do a tri-drive, if you can't find the tri-drive kits, the AMT kit has a longer wheel base as the kit was the base for the Tyrone Malone transporters wich has a transporter body behind the cab, so they don't have to be stretched. The Revell AG K100 has a Cummins NTC 475 Dual Turbo and a manual transmission so it's not the same as the Revell AG W900/T900 wich have a Cat 3408 and a different frame, the AMT has a Detroit Diesel 8V-92T and an Allison automatic transmission.
Revell...Monogram...it's pretty much the same thing, Revell and Monogram merged into one company in 1986 but the two brands were kept separate until the mid 90's when the kits were labeled Revell/Monogram, after that Monogram pretty much dissappeared and all kits were labeled Revell, but lately they have reinstated the Monogram lable and a Revell developed kit can be labeled Mongram and a Monogram developed kit can be labeled Revell regardless of origin...I don't like it as it gets confusing if you don't know your kit history well. But all Monogram developed kits are 1:24th scale and Revell has allways been 1:25th scale so the Monogram labeled kits in 1:25th scale were done after the merge 1986 and no new tooling kits from the Revell/Monogram Company after that are 1:24th scale. There are a couple of exceptions, the NASCAR kits, the 80's and 90's Pro Stock and Funny Car kits from Monogram and Revell were 1:24th scale but the tooling for them were originally developed before the merge.
Looks to be repops of the wheels from the later versions of the AMT 66 Mustang, others do them too. With todays technology it wouldn't be that hard to do a more correct wheel and print a master out with a 3D printer.
Over here in Sweden and Europe the length regulations has killed off the conventionals and all truck manufacturers are only doing cabovers as the demand for conventionals wasn't enough to continue production. Scania stopped making the T series 2005 and Volvo stopped making the NH 2006, Volvo still do conventionals for the North American market.
I was thinking about mentioning the GMP wheels but as they are a bit hard to come by I didn't. The wheels from the Revell 67 Shelby diecast are also missing the "inset angled" inner hub but otherwise they look quite good.