land drive trailer???

2.58s and 8.10s serious bit of kit! Mad Mario driving his motor!!!

guess I wont be fallowing through on that so!! was thinking alright that there must be a catch somewhere cause I couldn't find one anywhere on the net!!!
Would it not be harder to keep the ratios correct with a hydraulic motor?
id imagine that it would be next to impossible to get the flow and pressure to work in harmony in order to keep everything rotating in proportation to one-another?
ever seen the 6x6 defenders up close?

Hageslund (Spelling?) have a driven trailer - but i think that might have its own engine. Don't know how that's connected - but i would love one if i could afford it! (10K+ for shabby ****ty one with seized engine - ex MOD!)