Making something huge even bigger isn't easy, especially considering how hard it is to maintain the integrity of the original when Britney Spears kind of always sucked at singing. For trucks supersized just right, check out Big A** Trucks
From the hills of Kentucky, BAT's helmed by a certified diesel mechanic named Mike who builds one-of-a-kind monstrously modded vehicles designed to be road-legal, though he warns if you can't handle the power, "perhaps you should visit a more suitable site......maybe www.sissytruck.com" (Mike obviously also monstrously mods his jokes). Scouring the country for rigs that've been cared for and maintained "to [his] standards", each whip starts as a 2-2.5 ton medium sized "duty truck", which he shortens (both frame and driveline) before fabricating an ultra-strong subframe on which he drops a dually bed intended for a smaller truck, resulting in a look best described as Ba-Tonka-donk. Current beasts include a white '88 GMC Topkick rocking a turbocharged V8 Cat engine, Allison MT transmission, and Eaton 20K rearend brakes, all for a reasonable $14K, plus a slightly pricier fire-engine red '92 fuel-injection Topkick with full SLT interior, 22.5" wheels, and even a/c, which sadly will do nothing to cool the heat you catch while unnecessarily stomping all over every other car you see
There's also a section devoted to whips he's already sold, and another for those that're under construction for other clients, though if one of them particularly inspires you, for the right price he'll probably say "oops, I did it again".