Here's a route we've taken twice and like, partly because it has less tolls going south and is not as far out of the way as the I84-I81-US17 route which we've taken many times. Most of this route is suggested by Google when selecting "Avoid Tolls" when routing.
By leaving about 6 to 7PM we avoid most of the traffic delays around NYC. We take I84 to I684 to I287 around White Plains, cross the Tappan Zee bridge (no Toll going west), I287 has one toll where it is the Thruway. We tend to drive to 1 or 2AM so we can get past NYC and onto US202 the first night. We usually get gas off US202, there are a couple of stations that don't charge more for credit cards.
Get off I287 at US202 around Bridgwater, NJ and take that to NJ31 to I95. There you can get to I295 but we go thru Philly on I95 and avoid the Delaware Memorial Bridge toll. We've done this on a Saturday and Sunday morning with no issues.
Take I95 to DE1, just after the big bridge get off on exit 148 just before the toll and take Lorewood Grove Rd and a couple of other local roads to US301 South. Take US301 to MD295/I295 Baltimore/Washington Parkway (again no toll on the US301 bridge by Annapolis going west) to I395 around DC (as above weekend traffic has not been bad), then I95 to points south.
Note Google will try to take you on a local road with a no trucks sign in NJ to cut the corner on NJ31, I avoided it the first time but went down it the second, it was no problem, narrow like some of the local roads we have around here but much straighter. Also Lorewood Grove Rd is signed for no trucks, same thing there, it was no issue for me.
If you don't like narrow roads or don't like taking roads marked no trucks you can continue down I95 to US301, except there are a lot more traffic signals on that stretch (BTDT, Google routes you that way on the way back as you can't take the Lorewood Grove Rd directly to DE1 North).
This takes some non-interstate roads with traffic lights and about an hour longer than going all toll roads and taking the GW Bridge, but is a lot less stressful and more enjoyable drive, at least to us.
BTW, the GW Bridge going south (west) is free also, but going north (east) it costs $68 for our coach with a toad! Some of the toll bridges on the I95 route are high also, in the $25 range.
Another route to try is to take the Garden State Parkway from I287 to either US1 or the NJ Turnpike (we've done both). It takes only about 1/2 to 3/4 hour more but does not avoid the toll on the Delaware Memorial bridge. You still can choose to take US301 around Baltimore and part of DC.
If you do choose the GSP, there are some low clearances around where it intersects with I95 but if you stay in the middle lanes you'll be fine. There are whole threads in this forum (here's one
) on using the GSP. We've used the GSP for many years in various RV's including the current 12'6" high one without an issue.
Another note, if you don't have an EZ Pass for the RV, get one. We always use the EZ Pass lanes and never had an issue with tolls.
NYS offers an EZ Pass that gets you the car rate on the Thruway, it's a huge savings if you use the Thruway much. You just have to send or FAX in a copy of your MH registration and they give it to you. A side benefit is the Pike charges us like a car as well if we're not towing the toad.