We belonged to Harvest Hosts a year ago or so ago. Overall, IMO. it was a great experience.
I'm not sure what you will find along the east coast. Generally you'll be in a business's parking lot with no hookups. Out west there is more open space so usually they have larger parking lots. We've had no problems at locations west of the Mississippi. Also, keep in mind that the businesses listed on Harvest Hosts have little RV knowledge.
Our worst case
: In a mid-west location, they said to follow a gravel road to behind the barn to park for the night. They said there was 'plenty of space' to park back there. I opted to walk the road before committing to driving into a dead-end. Glad I did! There was no solid ground other than the road. Rain had turned the field area behind the barn into a soggy mess. We had to go elsewhere that night.
Our best case
: In Michigan at Fenn Valley Vineyards they allowed us to park out near the grape vines (not in a parking lot!) for almost a week while our truck was worked on! Very much above and beyond the expected and very much appreciated.
A down side to Harvest Hosts? We like wine (and beer) so we usually spend as much money (more?) in the tasting room and bottles to go with us than we'd would have spent for a RV site for a night or two. I'm happy with that.
The DW, not so much.
So as of today, we're not sure when we hit the road again this winter if will be in Harvest Hosts or not. Hope that was of some help.
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!