Ratgard is having a sale in their webshop on their R.A.T. customization kit.
From the announcement:
R.A.T (Remodulelizable All Terrain) platform is the universal chassis of Ratgard.com. This is a platform of modulrized chassis with unlimited length extension capability, can be used to convert variants 28mm Sc-Fi vehicle.
R.A.T was a part of Cargo-R.A.T Heavy Carrier before, and for separate sale with 38$ now.