We stayed at "Sitting Bull" Campground near Meadowlark Lake last summer and really enjoyed it. It's at 8,600 feet and has no hookups. I'm pasting some information from the US Forest Service site below.
1-877-444-6777 or make on-line reservation
From Ten Sleep, WY, take US Rt. 16 east 19.9 miles to campground
sign (Forest Rt. 432). Turn left at sign onto Rt. 432 (dirt) and
go about a mile to campground.
The elevation is 8,600 ft.
The campground is located in the treeline edge of an expansive
mountain meadow. The nearby Meadowlark Lake offers boating and
fishing opportunities. The campground is composed of a spur
along the meadow's edge and a loop nestled back in a thick stand
of Lodgepole pines. Each site has a lantern post. This is an
attractive campground that will accommodate almost any size RV.
Wildlife viewing is likely from this campground.
Gas, limited groceries, boat, bike rentals, boat ramp (no fee)
and restaurant are available at the nearby Meadowlark Lake
Open Seasonal: Yes
Open All Year: No
Open June 5 through September 20
RATE AND MAXIMUM STAY PERMITTED
Rate: $14 per day - single
Maximum Stay Permitted (days): 14
CAMPGROUND SITE CONFIGURATION
No. RV Sites: 0
No. Tent Sites: 0
No. Combined Sites (Tent or RV): 42
Total Sites: 42
Tent Pads: No
Group Tent Sites: Yes
Open Sites: No
Wooded Sites: Yes
No. Tables on Sites: 42
No. Grilles on Sites: 42
Group RV Sites: No
No. RV Pull Throughs: 0
Waste Station: No
Average Parking Apron Size: 16.5' X 63'
The parking aprons are gravel. An RV waste station, with potable water
and no fee, is located at Leigh Creek, 8.6 miles east of campground on
US Rt. 16 (mile marker 53).
Flush Toilets: No
Hot Showers: No
Wheelchair Friendly Toilets: Yes
Public Phone: No
No. Water Spigots (non-site): 5
No. Threaded: 0
The wheelchair friendly toilet is located between sites 4 and 5.
Nearby Meadowlark Lake provides boating opportunities.
Fishing is possible at nearby Meadowlark Lake.