TIP: Service zone
GET A SPONSOR !
Sponsoring is an inherent and necessary part of motorsport.
Sponsors of rally teams are difficult, but not impossible to get.
The first what a sponsor does not like, especially at the beginning is giving away cash. It is much easier to get convince a sponsor to lend you a tent (which they often have for promotional events) than give you money to pay for it. A sponsor will also be more open to buying a new tent in sponsors own name that funding it with your ownership.
Getting him to buy and land you a service mat, give you T-shirts, caps, jackets with company logo which they already have.
Sponsor is also likely to lend you folding seats, tables with company Logo.
This will help you to have a professional looking service zone and will be attractive enough for your sponsor to continue support of your team.