covering a 40 ft motor home.

If you want to land a 747 on it, I think they use 18" thick concrete for that.

4" or 5" with reinforcement will be more than enough. 10" is Interstate thickness

All sounds good, except that like msmith1199....you can probably save quite a bit of cash by going with a 4"-6" reinforced concrete pad rather than a 10" pad. 10" is a lot of concrete. My driveway is 4" non-reinforced and it's holding up fine with my 36' gasser...a few expansion cracks, but that's to be expected. Talk with a trusted contractor and get their opinion if you haven't already. Might save you enough to run the utilities....never know.....

While it doesn't hurt to pour 10 inch thick concrete, it is an overkill. I only have a 35 foot DP, but I parked it on a 4 inch pad for years and never had any problems. The concrete was reinforced with fiberglass and not rebar and it help up just fine.

Moved from ATC

I think I should have added, the drive way will be 72 feet long to get to the pad. All concrete and reinforced. Then we will have the pad and building. The cost will not be insignificient. So that's why we are waiting to run all the utilities. We are paying as we go. Why is it there is never enough money to do EVERYTHING we want? :)

DrewE and accsys, thank you for your thoughts. they are appreciated. The MoHo is 40 ft with three slides. The building will be 51 ft long and 20 ft wide. We are putting in PVC lines large enough to fit the lines thru at a later date. Also, if we at some point have an issue with the lines, we can pull them out and re run them easier. The business side of the rv will be away from the water/power/ waste, so we will be laying them under the concrete. We are going to run only a 30 amp line because we don't plan on the rv to be used while parked. The utilities will be only an as needed item. IE; packing and unpacking and cleaning. We have had another MoHo for many years and because of our mild climate have never winterized it.

From the looks of the old one tho, we should have built this building years ago. The sun is very strong here in the Carolinas.

Thank you both so much for your replies. they were appreciated and if you think of something we have missed, please chime in.

Hopefully you are making the garage large enough - it should be at least five feet longer than the MH and wide enough to walk around the slide outs when they are out. If you don't you will wish you did ---- don't ask!!! :B Also agree with running the utilities, especially a 50 amp line so you can run the ACs when packing unpacking and the residential reefer all the time if you have one.

If it were me, I would seriously consider running the utilities now, even if the water system consists of a single hose bib, the sewer of just a clean out (aka dump station) and the electric of just a 50A receptacle, rather than running some PVC pipe for later.

Water normally would not be in PVC, but in some other sort of tubing, and typically is just buried directly. If you have significant winter weather, heat tape may be needed (or the system drained for winter, which if designed with a proper slope may be a simple gravity drain).

Sewer would probably be PVC.

Electric is usually direct burial wire or wire in some sort of approved conduit, not normal PVC sewer pipe. If run in the PVC pipe, you probably would need to pull direct burial wire to comply with code, the pipe serving only for mechanical protection.

If you're planning on putting a panel in the building, I think code does require you to have a separate ground rod or other ground for the outbuilding...but check with someone who actually knows. (It's not required for a single circuit, possibly a 120/240V circuit, but required for a separate panel IIRC.) Sometimes that can be much more easily installed with initial construction.