My initial thought is that you are going to spend a ton of $$ compared to buying a big tex trailer that is already low and has other characteristics that you want then you can farkle it.
Don't mean to rain on your parade. If you are not really caring about the costs then ignore what I said above.
Where am I?
"I love the wild spaces above the border, takes some work to get here, ainít a Starbucks run." jdrocks