Roswell and Alamogordo how much to do, how long to stay

Bottomless lakes state park near Roswell is superb I would stay there for a couple of days just for the walking opportunies

http://www.emnrd.state.nm.us/SPD/bottomlesslakesstatepark.html
I did the route from Roswell to Fredericksburg, Tx which is on your route. I did it in the spring. Really enjoyed it.
used;
380 to 83/84 to 87 etc.
Fredericksburg is a German town stuck out in the middle of Texas with good German food and a nice main street to walk down.

Lady Bird Johnson park has camping


http://www.fbgtx.org/index.aspx?NID=343
Also just south of Fredericksburg is Luekenbach, Tx if your into country

I did not find the traffic bad but my rig is smaller and I have no towed and I am comfortable driving my rig.

We make that trip every year going out and coming back from summer vacation. I would stay at Oliver Lee SP outside Alamogordo, but be sure to reserve one of the few water/electricity sites. Near "Alamo," White Sands National Monument is a really fascinating place to visit. If you do that, I'd spend a couple nights at Alamogordo.

I would NOT get to San Antonio by going through Roswell, Carlsbad, and Pecos Texas. The traffic between Carlsbad and Pecos can be especially unnerving. The oil traffic on those two-lane roads is heavy, and those trucks travel fast. We go south on US 54 from Alamogordo to 375 and take that around the east side of El Paso to IH-10 east. From there, just decide where you'd like to stop to shorten the trip. There are few nice RV parks between El Paso and Junction, though Fort Stockton has some parks that are good enough for an overnight...but they are crowded with oil workers. I'd advise going through to Junction and staying at Junction North Llano River RV park if you want an easy overnight with full hookups and a great BBQ place nearby (Lum's BBQ). If you want natural beauty without full hookups (water/elec only), then stay at our favorite state park South Llano River SP.

From Junction it's a two-hour drive into San Antonio.

Alamogordo - tour White Sands Nat'l Monument - takes an afternoon if not hiking. Oliver Lee State Park is very nice. You could easily drive into Ruidoso if you like casinos. Other than that....not much.

Roswell - never been as it doesn't appeal to us, but perhaps you.

Fort Stockton is much better than Pecos.. . well, not much. If you're ready to stop around Pecos there's Monahans Sandhill State Park.

East on I-10 is Caverns of Sonora - a neat cave tour. They also have a campground.

Another idea after Alamogordo is to skip Roswell and head to Carlsbad and do the Carlsbad Caverns Nat'l Park tour or if you do it on your own, easily done, rent a 'wand' to carry along. It starts talking as you near something special - excellent.

Have a good trip!