If it's a bare SWB van, typically the price is around £2400 inc VAT for a Drivelodge in gelcoat. £2500 for a LWB. Painting is usually £275. Any van that's already fitted out and therefore needs stripping out they quote individually, but budget for around an extra £1000 if it's a 'camper' lined and with furniture etc.
Yes they do a bi-fold bed (we make it for them) which gives you more headroom than most as it doesn't just hinge from the back it folds so that it follows the roof line very closely.
Pikkis attached of one in a LWB van.
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