Questions about a semi pulling a 5th wheel...

So I have a buddy who owns a dump truck / backhoe company..3 or 4 of each...

He says I am nutz buying a RAM 2500/3500 and what I should be looking for is a newish semi w/an auto ..maybe a single axle like a Freightliner M2 with only a couple hundred thousand miles on it..we would need a back seat.. and I should carry a small car with me..unfortunately, he is low on details..he says they are out there..

He also said with the right gear ratio, I can get really great mileage numbers..unfortunately, all he has are numbers under full load..

Price wise...25 to 30K..

Have you ever heard or seen a semi pulling a 5th with a car on the back deck... ? I have seen the first part but not the second part. We do not want a toy hauler.

Sometimes free advice is worth exactly what you pay for it :)

Since I am in the middle of nowhere, maybe there is other stuff we just do see here..

ian