I see no reason why this can not be done and after seeing chieftain bridge layers in action in real life I am excited and looking forward to someone doing this.
Bridge layers, pontoon bridges and vacenes (spelling) can be simulated as shinRaiden has explained.
Even drops vehicles used to drop supplies and ammo can be created this way I assume, where a tuck drops its 'container'.
Armoured Vehicle Launcher Bridge (AVLB)
The AVLB launches a single Close Support Bridge to cross gaps of up to 24.5m or a combination of such bridges to cross gaps of up to 60m. A single bridge can be laid in about 3 minutes without exposing the crew. Once the bridge has been laid the launch vehicle can drive over it and recover it from the far bank.

Armoured Vehicle Royal Engineers (AVRE)
The AVRE provides intimate battlefield engineer support to armoured battle groups. It creates mobility by being able to breach minefields, cross gaps and clear obstacles. The crew remain protected throughout.

Floating Two Span Bridge
The BR 90 bridge system allows for two span bridges to be constructed by ABLE. Using 2 x 32m bridge sets, the centre of the bridge is supported by fixed or floating piers. A bridge with three floating piers is required to accommodate a 105 tonne loaded tank transporter.

Tank Bridge Transporter (TBT)
The Unipower 8x8 TBT is an improved mobility transporter for the new BR 90 bridging system. It can carry one No 10 bridge or two No 12 bridges. The TBT can self load from, and off-load to, the ground.

M3 Amphibious Rig
The M3 can be driven into a river and used as a ferry or, when a number are joined together from bank to bank, as a bridge, capable of taking vehicles as heavy as the Challenger MBT. A 100m river can be crossed in 30 minutes, using 8 rigs.

Messiah can you email me the link to the 'other forum' as I have lost the link!
tankieboy@tiscali.co.uk