If you ask me how to build a tow dolly, I just can give you these sites on build a tow dolly. The first site that I think has the most relevance with how to build a tow dollies is payloadz dot com. You can easily buy and download the technical eBook on ‘plans to build a tow dolly very detailed, easy to do, just for $7.88. It said that this eBook is not just an incomplete CD. This is a detailed guide on plans to build a tow dolly. The step by step plans of building a towing dolly is very easy to understand and completed with a complete material on related list to build your own tow dolly.
The next site I found related with building a tow dolly is northerntool dot com. They offer the Trailer Blueprints — Car Dolly, a complete, step by step procedure of instruction on it. I don’t know whether this match with what you’re looking for, but fyi, this item cost only for $29.99. It’s cheap enough for check it out and try the instruction on it. It’s of course needs a process in doing everything, including this lesson on how to build a tow dolly.
Ok, that’s all for this towing dolly, but for your info this build a tow dolly has 32 k search result on google.