Hi there, I've noticed that the Seatruck speed values provided in the Seatruck Horsepower upgrade page are wrong (old game version?) and give the impression that the Seatruck is much slower than it really is. I did my own testing and determined that the Max Speed with the HP upgrade are as follows:
0 to 2 modules: 9.18 m/s
3 modules: 8.89 m/s
4 modules: 7.28 m/s
5 modules: 6.17 m/s
6 modules: 5.21 m/s * (with docked Prawn)
The biggest difference is that there is no speed penalty with up to 2 modules, and it's also much faster overall even with more modules. Moreover, the docking module works differently, you go a bit slower with a docked Prawn suit, but faster than other modules if there's no Prawn.
I didn't measure speed without the HP upgrade, but I'd be willing to do it if someone wants to double check my results and upgrade the Wiki accordingly. I'm not familiar with Wikis so I'd rather someone else does it.
Thanks!