When we moved from CA to NM last year my 82 diesel was to weak to keep up. I
bought a towbar out of the thrifty ads and ordered a pair of  towing
adapters(there's a name for them but I forget) from Camping World. You only
have to drill one hole that is not visible if you want to remove them...cost
was about $185 or so. The advantage of towing it on all 4 was that we could
use the camper for rest stops and overnights.
Another possible benefit after seeing various brush and bully(no slight to
GM) bars is that the offer a very secure base to fabricate your own frontal
protection if you so desire. The list has been a big help to me.Just trying
to give back a little.