Walk most rental yards and you will see two businesses sharing one gravel lot. The back rows are the fleet. The front row, near the road, is what is for sale: the units coming off rent, the trade-ins, the machine that no longer earns its keep.

Two customers park in the same lot. One needs a machine Thursday for a three day dig. The other has been watching the used market for two months and wants to know hours, serial number and whether you will take his old one on trade.

Your counter knows the difference in about four seconds. Your Google Ads account, in most cases, has no idea.

A quick correction to something we wrote before

We have said, more than once, that a rental yard should block buyers. "For sale," "buy," "used," "for sale by owner," "financing," "price list," all of it into the negative keyword list, because a pure rental operation is paying for clicks from people who will never rent anything.

That advice holds, but only if you truly do not sell.

If you sell as well as rent, the job is not to block one side. It is to stop the two sides from stepping on each other.

They are two businesses, so give them two campaigns

Not two ad groups. Two campaigns, separated from the start, because almost every setting that matters is different.

The geography is different. Somebody renting a mini excavator wants it within delivery distance, usually 30 or 40 miles. Somebody buying a used mini excavator will hook up a trailer and drive four hours for the right machine at the right price. If both live in the same campaign, you either strangle your sales reach or you waste rental budget on people 200 miles away who were never going to rent from you.

The money is different. A rental lead might be worth a few hundred dollars over the season. A used machine sale is worth more than your whole month of ad spend. Those cannot share a budget line and be managed sensibly.

The urgency is different. Rental searches are this week. Sales searches run over weeks of looking, comparing and coming back. Same account, two completely different clocks.

Negatives run in both directions

This is the part people get half right. They add sales terms as negatives in the rental campaign, then forget the other half.

In the rental campaign, block: for sale, buy, used, financing, trade in, auction, dealer, parts, repair, price list.

In the sales campaign, block: rent, rental, hire, daily rate, weekly rate, rent to own if you do not offer it.

Without that second list, your sales campaign will happily collect "mini excavator rental" searches, because the machine name matches and Google is generous with what it considers close enough. Then your sales campaign burns budget on renters and your reporting looks like sales is performing well when it is just eating the rental campaign's lunch.

Check the search terms report in both campaigns every month. That report is where cannibalization shows up first.

Do not block the crossover

The interesting part of running both is that the two sides feed each other, and your ads should let that happen.

A contractor asking for a four month rental is a buyer who has not run the numbers yet. A buyer who is not ready to commit is a renter for the season. Rent to own sits right in the middle, and terms like "rent to own excavator" or "lease to own skid steer" are some of the best searches in this whole category, because the person is committed to getting the machine and only undecided about how to pay for it.

The short version

If you only rent, block the buyers. If you rent and sell, split them. Two campaigns, two negative lists pointed at each other, two conversion actions

Do this now: open your search terms report for the last 90 days and sort for the words buy, used and for sale. If those searches are showing up in a campaign meant to rent machines, you already have both businesses running in one campaign, and neither of them is getting your best work.

We only do Google Ads for equipment rental companies, including the ones that sell as well as rent. If you want a second set of eyes on your account, we will take an honest look and tell you what we see.