I use a Acme EZE tow dolly http://cartowdolly.com/
behind my 24 ft class C.
That was advertised that some assembly was required.
It came all welded construction with the wheels on it.
It has disk surge breaks and LED lights.
Tongue weight of 40 lbs and carries right at 5,000 lbs.
It was delivered by truck in a crate. Total weight was 400 lbs.
The assembly was the attachment of the lights and fenders.
Less than 30 min.
I am very pleased with mine.
If the brand you are talking about is anywhere close to the EZE from Acme
it should do well. I would not want a dolly that was NOT of welded construction.
They should be able to explain to you what you will need to do.