Can I use travel trailer while still coupled to tow vehicle?

For those mentioning the dreaded "oops, I forgot to do that before we drove off", I picked up a set of RVMinders (under $10). They have been a godsend. No more paper checkoff lists. No more forgetting to unplug, disconnect, etc. They slap on your steering wheel, so there is no chance of not seeing them before you drive off. The only potential issue is if you forget to attach them in the first place.