英国采购需求：硬壳车顶帐篷、天窗车顶帐篷、敞篷车顶帐篷、带书桌的车顶帐篷、带天窗入口的车顶帐篷、带天窗的硬壳帐篷

I'm interested in purchasing an internal entry roof tent designed for a large van that has a skylight. Could you provide me with details about the available options, including materials, features, and pricing? Additionally, I'd like to know about the installation process and any accessories you recommend to go with the tent. If you have any promotional offers or bundles available, please share those as well. Looking forward to your response!