Rat4go

+1 Either wiring to the sensor or sensor. Not related to the shock change unless the wiring you moved was speed sensor wires and they got messed up or maybe were partly damaged already and moving them 'finished the damage'. If it throws the 'service' warnings, the ABS is disabled, so you won't feel the pulsation mentioned by Metro12 at low speeds.

Legal in Michigan with a 'recreational double' driver's license endorcement and there are rules for how things are hooked up (safety chain requirements) and weights of trailers and here, the trailer attached to the truck must be a 5W. Doing this is legal in other states, too (and at longer overall lengths!) but I don't know all the requirements elsewhere....I've never run this set-up outside Michigan.

I know this thread is in a 1500 forum, but..... 2003 GMC Sierra 2500HD CCSB D/A, Keystone Laredo 5W with a 5x8 cycle trailer tagged to the back. XR650R, CRF230F, CRF80F and CRF70F on the trailer. Just shy of 63' tip to tail (2' short of max length for Mich req'ts for 'recreatational double' towing, so my rig has some room to grow when my kids and their cycles do). My little freight train.... When weighing options, I decided that this set-up was lighter than a 5W toy hauler, cheaper than a toy hauler, more interior 'living' space than a toy hauler, but.....it doesn't back up as easily as a 5w toy hauler! You thought little trailers were a PITA behind a truck....try a little trailer that you can't see very well tagged to the back of something with 12' of overhang! (I do have a home-brew back-up camera system on the 5W that feeds my laptop in the truck semi-wirelessly, so that helps a little.)