Hi
Earlier 52 and 03 plate 2.0 Hdi 800 LX with a side loading door in good well maintained condition will be the one to look at, either Berlingo or Partner. 1.9d are non turbo engines. 800 LX before 53 (facelift) have 800 kg payload so will do 1 operator and 500 litre tank with not too much equipment. Are treated as car derived van so car speed limits apply.
Facelift 03 plate onwards with 2.0 hdi engine +-780 kg payload and have lower speed limits.
All newer models to 58 plate 800 LX with 1.6 hdi engines are 800kgs payload (engine is lighter) and I believe are higher speed limits as per car derived vans. Suggest the 92 hp engine over 75hp. The 75 hp is still turboed with good torque - so much better performer that its predecessor, the 1.9 non turbo diesel engines.
Its essential that the 1.6 hdi engine has a good service history, preferrably main dealer as incorrect oil and incorrect oil draining procedures can affect 1.6hdi engine reliability.
PSA bought out a workshop bulletin to advise correct procedures on engine servicing which I doubt non franchise service garages will adhere to. The engine has to be hot, the van has to be level when draining the oil out by the sump plug, oil filter replaced and there is a standing time for draining - around an hour. (The preferred method of sucking the oil out of the sump through the dip stick tube isn't acceptable. Also, I believe the only oil that should be used is synthetic, so the one 'universal' petrol and diesel oil from their only 44 gallon drum won't do.
Spruce