How to Find Sales Contract Forms for RVs?

[stan]

We're close to reaching an agreement with a neighbor who has made an offer to buy our Airstream. Everything's gone smoothly, and we'd like to do whatever we can to keep things going well without involving a dealer or attorneys.

This is the first time we've sold an RV, and we don't know what type of sales contract or other agreements to use. I've searched the internet and come up with nothing specific to RVs. Some websites sell copies of general sales contracts or auto sales contracts for each state (we're in Texas), but I don't know if either type of agreement would apply in this case.

Does anyone out there have experience with sales contracts for RVs and where to find them? We're grateful for any help you can offer us.
Stan