Do any of you guys camp in a "B"?

Yes we tend to camp a week or more at a time.

My B has the double rear doors. I used the hook side of Velcro around the door frame (located just inside the closed door) in 2-3 in. lengths. Discovered long lengths tended to contract and make humps. Also had to trim the Velcro's width. Discovered Velcro glue not good in heat. Used Shoe Glue as a additional adhesive.
Netting was bought at the local fabric store and is wide enough to cover the full opening. Had a fancy name but was basically a strong fine black mesh. The netting sticks to the hook Velcro. All I did was roughly trim it to shape. Very compact, easy to store but it can be left in place. Total cost probably about$20-$30.

I haven't tried to do anything with the side door. I did make screens for both front door windows using the same mesh netting and rubber magnetic strips bought at Home Depot. Works great.

We think that traveling the US in a Class B is an ideal choice. These vehicles are great for travel, they can go and park almost anywhere. Although they are small (which really has some advantages) it hasn't impacted our extended stays in campgrounds or even just dry camping.
You are correct about the lack of a screen door on the sliding door of the typical Sprinter Van conversion. Advanced RV in Ohio is going to retrofit our vehicle for a screen door in May and we are very much looking forward to that.
If you have a Facebook account to can check out our Winnebago ERA page which chronicles our travels at:
https://www.facebook.com/pages/Winnebago-ERA/169426809735667

Unless I'm driving around my hometown I'm driving to or from a campsite. We have screens on our windows but no screen door. We can open a couple of windows and use fans, otherwise we turn on the A/C. Most of the time the Florida weather dictates the need for A/C. We had thought about screens for the Driver and passenger doors held in place with magnetic strips but never got around to making them. I think we camped in the "B" for over two months a few times while fishing in Florida. You must really be particular when packing for an extended stay. What first seems to be a necessity will sometimes turn into a "Why did we bring that" type item. :)

We don't use our B for travel - only camping. There are a couple of companies that make screens especially for the Class B motorhome. One of them is Skreenz. But, we don't have them installed on our unit.

We have 5 screened windows that can be opened plus a fantastic fan on the roof. That provides a lot of air circulation. As others have stated, there are aftermarket or DIY options for screens for the doors.

We have a '06 RT 170 that came with screen doors for the bouble back an a single for the main side door.It's proved to do a great job.

We camp & travel, up to about eight or nine weeks at a time, usually staying in one location from one to seven days. This winter, we've been doing our version of snowbirding, staying in various Florida locations a few days here, a few there.

Our previously-owned van came with a screen to fit inside the sliding door using Velcro. We leave it on there all the time. It has sand sewn into the lower hem as a weight to hold it down and a magnet patch to hold the two overlapping "doors" closed.

I bought some Skeeter Beaters made for a Sprinter - online - for the front driver and passenger side windows - they attach by magnets sewn in and work very well.

A reasonably handy person could make these screens. One of these years, we'll make a screen for back doors, maybe. The van also came from the converter with a total of six tilt-out small screened windows for ventilation, plus the roof hatch and Fantastic Fan.

We rarely use the AC, never at night for sleeping. On rare occasions, we'll use a little 12-volt circulating fan.

If I were shopping for a new van, I would look at the Great West ones with built in screen door. I noticed that Leisure's newest model has copied this great idea.

We do both: tour and camp. We only stay in commercial campgrounds when absolutely necessary. National forests, parks, state parks, etc., are more our style. We have had a couple of Class Cs but find them more hassle for touring or moving around the area once we camp.

Every rv is a compromise of something. Space, convenience, storage, bathroom, etc. We have found this Roadtrek just about the best compromise for us. Jim (in a posting above) mentioned Skreenz and provided a link. We agree and have used their product on our two front door windows for several years and find they work perfectly for us. With a Fantastic vent fan and the two back RT windows open, we never lack for air. When we are camped, we spend all of our time outside and carry a small 10x10 screen house for our "day room". We have tried several differnet approaches and find this fits our style best.

we love are Adventurous Roadtrek we made a side door screen it work will for us ,we camp a lot in state Park and forest,some commercial campground but we like the State park best.

An inexpensive solutionn for the side door opening is to purchase several yards of mosquito netting (get the extra fine made for noseeums) and hang it across the opening using velcro and add some weights at the bottom (wheel balancing wights are good). Have a hem at the top so you can use a curtain rod or something similar to suspend this curtain and use magnets on the sides to keep it attached to the side of the door opening. Actually two curtains work better, one overlaps the other by a foot or so in order that you can enter the B just by spreaqding the two curtains apart, then thwy will overlap each other after you enter/leave the vehicle. For front door windows, just make a pillow case out of the netting and place it over the door, when windows are rolled down the netting prevents entry of mosquitos, gnats, etc. There have been many postings over the years on do-it-yourself measures, suggest you try to pull them up to see different solutions.